2nd Class Mathematics Numbers

Numbers

Number System:   

• The number system contains ten digits 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9.
• The smallest 1 - digit counting number is 1.

The largest and the smallest numbers:

• The smallest 1 - digit number is 0 and the largest 1 - digit number is 9.
• The smallest 2 - digit number is 10 and the largest 2 - digit number is 99.
• The smallest 3 - digit number is 100 and the largest 3 - digit number is 999.

Place Value Chart:     

• 10 Ones =1 Ten
• 10 Tens = 1 Hundred
• 10 Hundreds = 1 Thousand

Place Value of each digit in a number:

In a three digit number, there are three places, namely -

Ones place, Tens place and Hundreds place.

Ascending Order of numbers:

Arranging numbers from the least number to the largest number is called Ascending Order.

e.g., 13, 67,132,168 are numbers in ascending order.

Descending Order of numbers:

Arranging numbers from the largest number to the least number is called Descending Order.

e.g., 168,132, 67, 13 are numbers in descending order.

Rules for comparison of numbers:

Rule 1:           A numeral containing more digits is greater.

Rule 2:           If two numerals contain the same number of digits, the numeral having greater digit at the left most place will be greater.

Rule 3:           If the left most digits are also the same, consider the next digit from the left and compare. If these digits are also the same, then consider the next digit from the left and compare. The number with greater digit in this

Successor of a numeral:

The successor of a particular numeral comes just after that numeral. So, we can find out the successor of a numeral by adding 1 to the given numeral.

e.g., The successor of 99 is 99 + 1 =100.\

Predecessor of a numeral:

The predecessor of a particular numeral comes just before that numeral. So, we can find out the predecessor of a numeral by subtracting 1 from the given numeral.

e.g., The predecessor of 100 is 100 - 1 = 99.

Even numbers:

The numbers that have 2, 4, 6, 8 and 0 in the ones place are called even numbers.

e.g., 4, 32,168, 490 and 746 are even numbers.

Odd numbers:

The numbers that have 1, 3, 5, 7 and 9 in the ones place are called odd numbers. e.g., 3, 41, 195, 479 and 207 are odd numbers.