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\ 14-Nov-2025 Bharat Arora Proof-7 Reader’s Sign _______________________ Date __________

Example 5. 4 + 5 + 6 = ?
T O
Solution: Group the numbers 4
for tens. We know that 4 and

6 make 10, so we can add 5
them together first. Then we + 6 Check if the sum of
add 5 to 10. 1 5 any two numbers

So, 4 + 5 + 6 = 15. is 10.

Exercise 2E

1. Add the following by regrouping.

a. T O b. T O c. T O

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

2. Find the sum. remember to add by regrouping the ones first.

a. T O b. T O c. T O d. T O

1 2 2 6 2 5 2 1

+ 1 8 + 1 4 + 3 5 + 3 9

e. T O f. T O g. T O h. T O

1 8 3 2 2 6 4 9

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

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Addition