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question_answer1)
What are the numbers which have more than two factors called?
A)
Even numbers done
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B)
Prime numbers done
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C)
Composite numbers done
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D)
Odd numbers done
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question_answer2)
What are the numbers which have only two factors (1 and the number itself) called?
A)
Composite numbers done
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B)
Even numbers done
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C)
Prime numbers done
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D)
Odd numbers done
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question_answer3)
Which is the number that is neither prime nor composite?
A)
0 done
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B)
1 done
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C)
2 done
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D)
5 done
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question_answer4)
Which of the following is the L.C.M. of 36 and 72?
A)
36 done
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B)
72 done
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C)
108 done
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D)
2 done
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question_answer5)
What is the L.C.M. of 17 and 5?
A)
105 done
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B)
95 done
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C)
85 done
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D)
5 done
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question_answer6)
What is the H.C.F. of 17 and 5?
A)
1 done
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B)
5 done
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C)
17 done
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D)
85 done
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question_answer7)
Give an example for twin primes.
A)
5, 11 done
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B)
3, 5 done
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C)
11, 17 done
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D)
3, 7 done
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question_answer8)
What is the H.C.F. of two co-prime numbers?
A)
1 done
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B)
0 done
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C)
2 done
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D)
4 done
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question_answer9)
Which of the following is an example of an even number?
A)
10351 done
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B)
20989 done
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C)
69007 done
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D)
973572 done
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question_answer10)
What is the H.C.F. of 120, 144 and 216 ?
A)
38 done
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B)
24 done
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C)
120 done
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D)
144 done
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question_answer11)
What do you get when you multiply two factors?
A)
Sum done
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B)
Product done
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C)
Difference done
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D)
Quotient done
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question_answer12)
Every number is a _____ and a _____ of itself.
A)
factor, multiple done
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B)
prime, composite done
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C)
even, odd done
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D)
prime, twin prime done
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question_answer13)
What are the numbers which are multiples of 2 called?
A)
Odd numbers done
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B)
Even numbers done
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C)
Prime numbers done
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D)
Composite numbers done
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question_answer14)
What is the H.C.F. of the two numbers equal to?
A)
Product of the numbers \[\div \] their L.C.M. done
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B)
Product of the numbers \[\times \] their L.C.M. done
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C)
Product of the numbers. done
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D)
Quotient of the numbers. done
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question_answer15)
Which of these numbers is a factor of every number ?
A)
0 done
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B)
1 done
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C)
2 done
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D)
4 done
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question_answer16)
How many prime numbers are there between 1 and 50?
A)
18 done
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B)
12 done
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C)
15 done
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D)
20 done
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question_answer17)
A is the 5th prime number. B is the 7th prime number. What is B - A?
A)
6 done
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B)
8 done
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C)
12 done
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D)
2 done
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question_answer18)
What is the number of prime numbers between 50 and 60?
A)
1 done
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B)
2 done
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C)
3 done
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D)
4 done
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question_answer19)
Which of the following is the prime factorisation of 140?
A)
\[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 7}\] done
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B)
\[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5}\] done
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C)
\[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5 }\!\!\times\!\!\text{ 7}\] done
clear
D)
\[\text{2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 5 }\!\!\times\!\!\text{ 7 }\!\!\times\!\!\text{ 3}\] done
clear
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question_answer20)
The successor of every even number is
A)
even done
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B)
prime done
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C)
odd done
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D)
composite. done
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question_answer21)
What is the sum of the first five multiples of 6?
A)
90 done
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B)
60 done
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C)
30 done
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D)
120 done
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question_answer22)
What is the smallest number which when divided by 20, 25, 35 and 40 leaves a remainder of 14, 19, 29 and 34 respectively?
A)
1394 done
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B)
1404 done
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C)
1664 done
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D)
1406 done
clear
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question_answer23)
What is the least number which when decreased by 7 is exactly divisible by 12, 16, 18, 21 and 28?
A)
1012 done
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B)
1008 done
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C)
1015 done
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D)
1022 done
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question_answer24)
What is the greatest 4-digit number exactly divisible by 12, 15, 20 and 35?
A)
9999 done
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B)
9660 done
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C)
9832 done
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D)
9860 done
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question_answer25)
Four bells ring at intervals of 6, 7, 8 and 9 seconds respectively. After how many seconds do all the bells ring together?
A)
504 done
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B)
516 done
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C)
508 done
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D)
512 done
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question_answer26)
What is the greatest number that divides 37,50 and 123 leaving remainders 1,2 and 3 respectively?
A)
9 done
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B)
10 done
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C)
15 done
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D)
12 done
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question_answer27)
A number is always divisible by 90 if
A)
it is divisible by both 2 and 45. done
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B)
it is divisible by both 5 and 18. done
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C)
it is divisible by both 9 and 10. done
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D)
All the above. done
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question_answer28)
Statement-I: 1 is a factor of every number. Statement-II: 2 is the first prime number. Which of the following options is correct?
A)
I only done
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B)
II only done
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C)
Both I and II done
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D)
Neither I nor II done
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question_answer29)
Which of the following numbers is divisible by 11?
A)
3,116,365 done
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B)
901,351 done
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C)
8,790,322 done
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D)
311,136 done
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question_answer30)
Which of the following numbers is a perfect number?
A)
6 done
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B)
28 done
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C)
6 and 28 done
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D)
34 done
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question_answer31)
Every even number greater than 4 can be expressed as a sum of two odd prime numbers. Which of the following is an example for this statement?
A)
8 = 1 + 7 done
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B)
8 = 3 + 5 done
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C)
4 = 1 + 3 done
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D)
4 = 2 + 2 done
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question_answer32)
What is the least value that should be given to * so that the number 653*47 is divisible by 11?
A)
9 done
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B)
6 done
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C)
2 done
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D)
1 done
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question_answer33)
The L.C.M. of 64 and 48 is 192.What is the H.C.F. of these numbers?
A)
16 done
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B)
24 done
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C)
8 done
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D)
12 done
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question_answer34)
What is the prime factorisation of 143?
A)
\[\text{2 }\!\!\times\!\!\text{ 11 }\!\!\times\!\!\text{ 13}\] done
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B)
\[\text{11 }\!\!\times\!\!\text{ 13}\] done
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C)
\[\text{2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 7}\] done
clear
D)
\[\text{1 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 7}\] done
clear
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question_answer35)
The L.C.M of two numbers is 3718. Which of the following numbers CANNOT possibly be the H.C.F of these numbers?
A)
13 done
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B)
26 done
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C)
104 done
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D)
143 done
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question_answer36)
The answers of four students A, B, C and D for prime factorisation of 24 are given. Whose answer is wrong?
A)
\[\text{2}\times \text{2}\times \text{2}\times \text{3}\] done
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B)
\[\text{8 }\!\!\times\!\!\text{ 3}\] done
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C)
\[\text{3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\] done
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D)
\[\text{2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\] done
clear
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question_answer37)
The table given lists the number of factors for some numbers.
Number |
Number of factors |
21 |
4 |
23 |
2 |
25 |
3 |
27 |
4 |
29 |
2 |
What is the number of prime numbers between 20 and 30 from the given table?
A)
0 done
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B)
2 done
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C)
3 done
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D)
4 done
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question_answer38)
Find a number which is a multiple of all the numbers from 1 to 10?
A)
5040 done
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B)
1260 done
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C)
720 done
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D)
1440 done
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question_answer39)
Observe the following sums.
What is the result of the sum 1+3+5+7+9+ ..... +15?
A)
121 done
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B)
81 done
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C)
100 done
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D)
64 done
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question_answer40)
How many factors does 48 have?
A)
2 done
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B)
4 done
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C)
8 done
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D)
10 done
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question_answer41)
Which of the following is a factor of the number shown on the spike abacus?
A)
10 done
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B)
7 done
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C)
5 done
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D)
8 done
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question_answer42)
Ravi wrote two digits of a 3-digit number on the blackboard as shown below.
Find the missing digit if 11 is its factor.
A)
2 done
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B)
4 done
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C)
6 done
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D)
8 done
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question_answer43)
Which of the following is a prime number?
A)
117 done
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B)
171 done
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C)
179 done
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D)
143 done
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question_answer44)
Which of the following is a composite number?
A)
23 done
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B)
29 done
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C)
32 done
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D)
13 done
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question_answer45)
Which of the following products is an odd number?
A)
\[\text{even }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ even}\] done
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B)
\[\text{odd }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ even}\] done
clear
C)
\[\text{even }\!\!\times\!\!\text{ even }\!\!\times\!\!\text{ even}\] done
clear
D)
\[\text{odd }\!\!\times\!\!\text{ odd }\!\!\times\!\!\text{ odd}\] done
clear
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question_answer46)
What is the greatest number which divides 134 and 167 leaving 2 as remainder in each case?
A)
34 done
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B)
37 done
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C)
39 done
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D)
33 done
clear
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question_answer47)
What is the L.C.M. of 12, 15, 20 and 27?
A)
270 done
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B)
360 done
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C)
480 done
clear
D)
540 done
clear
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question_answer48)
If a and bare co-primes, then what is their L.C.M.?
A)
1 done
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B)
\[\frac{\text{a}}{\text{b}}\] done
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C)
\[\text{ab}\] done
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D)
\[\text{a + b}\] done
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question_answer49)
Three bells toll together at intervals of 9, 12 and 15 minutes. If they start toiling together, after what time will they toll next?
A)
1 hour done
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B)
\[\text{1}\frac{1}{2}\]hours done
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C)
\[2\frac{1}{2}\] hours done
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D)
3 hours done
clear
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question_answer50)
Observe the given multiples of 37. \[\underline{\begin{align} & \underline{\begin{align} & \text{37 }\times \text{ 3=111} \\ & \text{37 }\times \text{ 6 = 222} \\ & \text{37 }\times \text{ 9 = 333} \\ & \text{37 }\times \text{ 12=444} \\ \end{align}} \\ & \\ \end{align}}\] Find the product of\[\text{37 }\!\!\times\!\!\text{ 27}\].
A)
999 done
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B)
The greatest 3 digit number. done
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C)
Both [a] and [b] done
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D)
The smallest 3-digit number. done
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question_answer51)
The lowest common multiple of 8,16 and p is 48. What is the possible value of p?
A)
64 done
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B)
24 done
clear
C)
2 done
clear
D)
32 done
clear
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question_answer52)
67, 61, p, q, r, s, 41 is an arrangement of prime numbers in decreasing order. Among the following, which is the number 53?
A)
p done
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B)
r done
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C)
q done
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D)
s done
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question_answer53)
The sum of all the prime factors of m is 9. Find the number m.
A)
15 done
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B)
28 done
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C)
20 done
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D)
63 done
clear
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question_answer54)
Which of the following is the least perfect square which is divisible by 3,4,5,6 and 8?
A)
900 done
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B)
2500 done
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C)
1200 done
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D)
3600 done
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question_answer55)
What is the L.C.M. of X and Y if X is the first odd prime number and Y is the only even prime number?
A)
6 done
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B)
2 done
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C)
8 done
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D)
12 done
clear
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question_answer56)
Given that (p + 3) is the highest common factor of 81 and 108, find the value of p.
A)
6 done
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B)
9 done
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C)
12 done
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D)
24 done
clear
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question_answer57)
Identify the H.C.F. of the first even number and the fifth composite number.
A)
10 done
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B)
2 done
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C)
20 done
clear
D)
5 done
clear
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question_answer58)
What is the possible value of the product of P and Q, given that their H.C.F is 12 and L.C.M is 120?
A)
1200 done
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B)
120 done
clear
C)
1440 done
clear
D)
144 done
clear
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