6th Class Mathematics Playing with Numbers Question Bank

done Playing with Numbers Total Questions - 58

• question_answer1)
  What are the numbers which have more than two factors called?
  A)
   Even numbers done clear
  B)
   Prime numbers done clear
  C)
   Composite numbers   done clear
  D)
   Odd numbers done clear
  View Solution play_arrow

• question_answer2)
  What are the numbers which have only two factors (1 and the number itself) called?
  A)
   Composite numbers done clear
  B)
   Even numbers done clear
  C)
   Prime numbers   done clear
  D)
   Odd numbers done clear
  View Solution play_arrow

• question_answer3)
  Which is the number that is neither prime nor composite?
  A)
   0                                             done clear
  B)
   1   done clear
  C)
   2                             done clear
  D)
  5 done clear
  View Solution play_arrow

• question_answer4)
  Which of the following is the L.C.M. of 36 and 72?
  A)
  36                                          done clear
  B)
  72   done clear
  C)
  108                        done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer5)
  What is the L.C.M. of 17 and 5?
  A)
  105                                        done clear
  B)
  95 done clear
  C)
  85                            done clear
  D)
  5 done clear
  View Solution play_arrow

• question_answer6)
  What is the H.C.F. of 17 and 5?
  A)
  1                               done clear
  B)
  5 done clear
  C)
  17                          done clear
  D)
  85 done clear
  View Solution play_arrow

• question_answer7)
  Give an example for twin primes.
  A)
  5, 11                      done clear
  B)
  3, 5   done clear
  C)
  11, 17   done clear
  D)
  3, 7 done clear
  View Solution play_arrow

• question_answer8)
  What is the H.C.F. of two co-prime numbers?
  A)
   1                                               done clear
  B)
   0 done clear
  C)
   2                                             done clear
  D)
   4 done clear
  View Solution play_arrow

• question_answer9)
  Which of the following is an example of an even number?
  A)
  10351   done clear
  B)
  20989 done clear
  C)
  69007   done clear
  D)
  973572   done clear
  View Solution play_arrow

• question_answer10)
  What is the H.C.F. of 120, 144 and 216 ?
  A)
  38                          done clear
  B)
  24   done clear
  C)
  120                        done clear
  D)
  144 done clear
  View Solution play_arrow

• question_answer11)
  What do you get when you multiply two factors?
  A)
  Sum                      done clear
  B)
  Product   done clear
  C)
  Difference         done clear
  D)
  Quotient done clear
  View Solution play_arrow

• question_answer12)
  Every number is a _____ and a _____ of itself.
  A)
   factor, multiple   done clear
  B)
   prime, composite done clear
  C)
   even, odd done clear
  D)
   prime, twin prime done clear
  View Solution play_arrow

• question_answer13)
  What are the numbers which are multiples of 2 called?
  A)
   Odd numbers done clear
  B)
   Even numbers   done clear
  C)
   Prime numbers done clear
  D)
   Composite numbers done clear
  View Solution play_arrow

• 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 clear
  B)
   Product of the numbers \[\times \] their L.C.M. done clear
  C)
   Product of the numbers. done clear
  D)
   Quotient of the numbers. done clear
  View Solution play_arrow

• question_answer15)
  Which of these numbers is a factor of every number ?
  A)
  0                                             done clear
  B)
  1   done clear
  C)
  2                             done clear
  D)
  4 done clear
  View Solution play_arrow

• question_answer16)
  How many prime numbers are there between 1 and 50?
  A)
   18                                          done clear
  B)
   12 done clear
  C)
   15                            done clear
  D)
  20 done clear
  View Solution play_arrow

• question_answer17)
  A is the 5th prime number. B is the 7th prime number. What is B - A?
  A)
  6                               done clear
  B)
  8 done clear
  C)
  12                                          done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer18)
  What is the number of prime numbers between 50 and 60?
  A)
   1                                             done clear
  B)
   2   done clear
  C)
   3                             done clear
  D)
  4 done clear
  View Solution play_arrow

• question_answer19)
  Which of the following is the prime factorisation of 140?
  A)
  \[\text{2  }\!\!\times\!\!\text{  2  }\!\!\times\!\!\text{  7}\]        done clear
  B)
  \[\text{2  }\!\!\times\!\!\text{  2  }\!\!\times\!\!\text{  5}\] done clear
  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
  View Solution play_arrow

• question_answer20)
  The successor of every even number is
  A)
  even     done clear
  B)
  prime done clear
  C)
  odd                         done clear
  D)
  composite. done clear
  View Solution play_arrow

• question_answer21)
  What is the sum of the first five multiples of 6?
  A)
  90                            done clear
  B)
  60 done clear
  C)
  30                          done clear
  D)
  120 done clear
  View Solution play_arrow

• 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 clear
  B)
  1404 done clear
  C)
  1664      done clear
  D)
  1406 done clear
  View Solution play_arrow

• 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 clear
  B)
  1008 done clear
  C)
  1015        done clear
  D)
  1022 done clear
  View Solution play_arrow

• question_answer24)
  What is the greatest 4-digit number exactly divisible by 12, 15, 20 and 35?
  A)
   9999                      done clear
  B)
   9660   done clear
  C)
   9832                      done clear
  D)
   9860 done clear
  View Solution play_arrow

• 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 clear
  B)
  516 done clear
  C)
  508                        done clear
  D)
  512 done clear
  View Solution play_arrow

• question_answer26)
  What is the greatest number that divides 37,50 and 123 leaving remainders 1,2 and 3 respectively?
  A)
  9                             done clear
  B)
  10 done clear
  C)
  15                          done clear
  D)
  12   done clear
  View Solution play_arrow

• question_answer27)
  A number is always divisible by 90 if
  A)
   it is divisible by both 2 and 45. done clear
  B)
   it is divisible by both 5 and 18. done clear
  C)
   it is divisible by both 9 and 10. done clear
  D)
   All the above.   done clear
  View Solution play_arrow

• 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 clear
  B)
   II only done clear
  C)
   Both I and II         done clear
  D)
  Neither I nor II done clear
  View Solution play_arrow

• question_answer29)
  Which of the following numbers is divisible by 11?
  A)
  3,116,365            done clear
  B)
  901,351   done clear
  C)
  8,790,322            done clear
  D)
  311,136 done clear
  View Solution play_arrow

• question_answer30)
  Which of the following numbers is a perfect number?
  A)
  6                             done clear
  B)
  28 done clear
  C)
  6 and 28                done clear
  D)
  34 done clear
  View Solution play_arrow

• 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 clear
  B)
  8 = 3 + 5   done clear
  C)
  4 = 1 + 3               done clear
  D)
  4 = 2 + 2 done clear
  View Solution play_arrow

• 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 clear
  B)
  6 done clear
  C)
  2                             done clear
  D)
  1   done clear
  View Solution play_arrow

• question_answer33)
  The L.C.M. of 64 and 48 is 192.What is the H.C.F. of these numbers?
  A)
  16                                            done clear
  B)
  24 done clear
  C)
  8                                             done clear
  D)
  12 done clear
  View Solution play_arrow

• question_answer34)
  What is the prime factorisation of 143?
  A)
   \[\text{2 }\!\!\times\!\!\text{ 11 }\!\!\times\!\!\text{ 13}\]       done clear
  B)
  \[\text{11 }\!\!\times\!\!\text{ 13}\]   done clear
  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
  View Solution play_arrow

• 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 clear
  B)
  26 done clear
  C)
  104                          done clear
  D)
  143 done clear
  View Solution play_arrow

• 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 clear
  B)
  \[\text{8 }\!\!\times\!\!\text{ 3}\]   done clear
  C)
  \[\text{3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\]              done clear
  D)
  \[\text{2 }\!\!\times\!\!\text{ 3 }\!\!\times\!\!\text{ 2 }\!\!\times\!\!\text{ 2}\] done clear
  View Solution play_arrow

• 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 clear
  B)
   2   done clear
  C)
   3                             done clear
  D)
  4 done clear
  View Solution play_arrow

• question_answer38)
  Find a number which is a multiple of all the numbers from 1 to 10?
  A)
  5040        done clear
  B)
  1260 done clear
  C)
  720                        done clear
  D)
  1440 done clear
  View Solution play_arrow

• question_answer39)
  Observe the following sums. What is the result of the sum 1+3+5+7+9+ ..... +15?
  A)
  121                        done clear
  B)
  81 done clear
  C)
  100                        done clear
  D)
  64   done clear
  View Solution play_arrow

• question_answer40)
  How many factors does 48 have?
  A)
  2                             done clear
  B)
  4 done clear
  C)
  8                             done clear
  D)
  10   done clear
  View Solution play_arrow

• question_answer41)
  Which of the following is a factor of the number shown on the spike abacus?
  A)
   10                                          done clear
  B)
   7 done clear
  C)
   5                             done clear
  D)
  8   done clear
  View Solution play_arrow

• 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 clear
  B)
   4 done clear
  C)
   6                             done clear
  D)
  8 done clear
  View Solution play_arrow

• question_answer43)
  Which of the following is a prime number?
  A)
  117                        done clear
  B)
  171 done clear
  C)
  179                          done clear
  D)
  143 done clear
  View Solution play_arrow

• question_answer44)
  Which of the following is a composite number?
  A)
  23                          done clear
  B)
  29 done clear
  C)
  32                            done clear
  D)
  13 done clear
  View Solution play_arrow

• question_answer45)
  Which of the following products is an odd number?
  A)
   \[\text{even  }\!\!\times\!\!\text{  odd  }\!\!\times\!\!\text{  even}\] done clear
  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
  View Solution play_arrow

• question_answer46)
  What is the greatest number which divides 134 and 167 leaving 2 as remainder in each case?
  A)
   34                                          done clear
  B)
   37 done clear
  C)
   39                                          done clear
  D)
   33   done clear
  View Solution play_arrow

• question_answer47)
  What is the L.C.M. of 12, 15, 20 and 27?
  A)
  270                        done clear
  B)
  360 done clear
  C)
  480                        done clear
  D)
  540   done clear
  View Solution play_arrow

• question_answer48)
  If a and bare co-primes, then what is their L.C.M.?
  A)
  1                             done clear
  B)
  \[\frac{\text{a}}{\text{b}}\] done clear
  C)
  \[\text{ab}\]                       done clear
  D)
  \[\text{a + b}\] done clear
  View Solution play_arrow

• 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 clear
  B)
  \[\text{1}\frac{1}{2}\]hours done clear
  C)
  \[2\frac{1}{2}\] hours    done clear
  D)
  3 hours   done clear
  View Solution play_arrow

• 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 clear
  B)
   The greatest 3 digit number. done clear
  C)
   Both [a] and [b]   done clear
  D)
   The smallest 3-digit number. done clear
  View Solution play_arrow

• question_answer51)
  The lowest common multiple of 8,16 and p is 48. What is the possible value of p?
  A)
   64                          done clear
  B)
   24   done clear
  C)
   2                             done clear
  D)
  32 done clear
  View Solution play_arrow

• 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 clear
  B)
  r done clear
  C)
  q                              done clear
  D)
  s done clear
  View Solution play_arrow

• question_answer53)
  The sum of all the prime factors of m is 9. Find the number m.
  A)
  15                          done clear
  B)
  28 done clear
  C)
  20                                            done clear
  D)
  63 done clear
  View Solution play_arrow

• question_answer54)
  Which of the following is the least perfect square which is divisible by 3,4,5,6 and 8?
  A)
  900                        done clear
  B)
  2500 done clear
  C)
  1200      done clear
  D)
  3600   done clear
  View Solution play_arrow

• 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 clear
  B)
  2 done clear
  C)
  8                             done clear
  D)
  12 done clear
  View Solution play_arrow

• question_answer56)
  Given that (p + 3) is the highest common factor of 81 and 108, find the value of p.
  A)
  6                             done clear
  B)
  9 done clear
  C)
  12                          done clear
  D)
  24   done clear
  View Solution play_arrow

• question_answer57)
  Identify the H.C.F. of the first even number and the fifth composite number.
  A)
  10                          done clear
  B)
  2   done clear
  C)
  20                          done clear
  D)
  5 done clear
  View Solution play_arrow

• 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 clear
  B)
  120 done clear
  C)
  1440        done clear
  D)
  144 done clear
  View Solution play_arrow