Grade 2, Maths Olympiad (CBSE) - Subtraction 

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Grade 2  |   Maths  |   Subtraction, Computation Operations, Olympiad, CBSE, ICSE, Maths Olympiad, Science Olympiad, English Olympiad

Subtraction means deducting two or ore quantities i.e. taking out some of the numbers from another number.

It is denoted by a "-" symbol.

The result of subtraction is called "difference".

THINGS TO REMEMBER:

1. If a & b are two whole numbers such that a>b or a=b , then  (a-b )then the answer will always be positive.

       Example:  5-1=4

2. if a<b then the answer will be negative.

       Example: 1-5=-4

3. The commutative property is FALSE in the condition of Subtraction.

      i.e. (a-b) is not equal to (b-a)

      Example: a=25     b=4

                       (a-b) = 25-4=21

                       (b-a) = 4-25=-21

                       (a-b)  =/=  (b-a)

4. If any whole number other than zero is subtracted form 0, then

                       a-0=a

                       0-a is not defined.

5. The subtraction of whole numbers is not associative. That is, if a, b, c are three whole numbers, then in general a – (b – c) is not equal to (a – b) – c.

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