Page 29 - Maths Class 04

Property 3 : The way in which we group addends does not change the sum.

+ = +

(3 + 6) + 2 = 2 + (6 + 3) = 11

This is known as the grouping property of addition .

Example : Add 42934, 25670 and 13456 in different orders.

Solution : a. 4 2 9 3 4 b. 4 2 9 3 4 c. 2 5 6 7 0

+ 2 5 6 7 0 + 1 3 4 5 6 + 1 3 4 5 6

+ 1 3 4 5 6 + 2 5 6 7 0 + 4 2 9 3 4
8 2 0 6 0 8 2 0 6 0 8 2 0 6 0

d. 2 5 6 7 0 e. 1 3 4 5 6 f. 1 3 4 5 6

+ 4 2 9 3 4 + 4 2 9 3 4 + 2 5 6 7 0

+ 1 3 4 5 6 + 2 5 6 7 0 + 4 2 9 3 4

8 2 0 6 0 8 2 0 6 0 8 2 0 6 0

Know
Know
Know
Get
Get to
Get
to
When we add ‘1’ to a number, we get next number or the successor of the given
number. 75311 + 1 = 75312

Practice - 2.3
Practice - 2.3
Practice - 2.3
Practice - 2.3
Fill in the blanks.

1. 57893 + 46321 = 46321 + _____________

2. _____________ + 29378 = 29378 + 42073
3. 9571321 + _____________ = 9571321

4. 0 + _____________ = 32967

5. 27945 + _____________ = 47830 + _____________
6. 732145 + 29346 + 45932 = _____________ + 732145 + 29346

Mathematics-4 29