Page 17 - SM Class 5 Inner.cdr

Example 4 : 131235 + 223525 = 354760

133525 + 221235 = 354760
This property is also called commutative property.
2. Grouping Property

The way in which three numbers are grouped for addition does not change their
sum.

Example 5 : Add 2,48,015, 1,76,240 and 93,148
Also, 2,48,015 + 1,76,240 + 93,148 2,48,015 + 1,76,240 + 93,148
= (2,48,015 + 1,76,240) + 93,148 2,48015 + (1,76,240 + 93,148)
= 4,24,255 + 93, 148 2,48,015 + 2,69,388

= 5,17,403 = 5,17,403
This property is also called Associative Property.

3. Zero Property

The sum of a non-zero addend and zero is the non-zero addend.
For example : 5,43,572 + 0 = 5,43,572 and 0 + 5,43,572 = 5,43,572

This property is also called Identity Property.

E xercise 2.1

1. Add the following :

a. b. c.
4 3 7 2 5 4 3 5 3 7 6 2 9 1 3 4 2 4 6 6 4
+ 2 1 2 5 4 5 2 + 2 4 2 3 3 7 8 + 3 5 2 3 2 8

d. 3 2 7 5 7 9 e. 2 3 6 8 4 8 3 f. 4 2 3 8 5 1 9

+ 2 9 6 6 2 1 + 4 7 3 8 1 5 + 3 4 4 6 4 3

g. 5 3 3 3 4 8 1 h. 5 6 7 6 1 2 1 8 i. 4 8 3 3 4 1 8

+ 3 6 6 9 9 2 4 + 2 9 3 5 9 3 2 + 5 4 3 9 2 3 1 2

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Mathematics In Focus - 5