Page 48 - Math Genius C2

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3. First add the same numbers. then, add the remaining number to the sum.
(a) t O (b) t O (c) t O (d) t O

4 5 8 6
3 5 3 3
+ 4 + 7 + 3 + 6

CheCkING ADDITION

We have learnt addition of numbers. Now, we will learn the method of checking
answers. It will help us know if the answer is correct. We use the order property
for this.

example 1: Add 16, 37 and 8 and check example 2: Find the sum of 14, 18 and
the answer. 43.
Solution: Solution:

t O t O t O t O
2 2 1 1
1 6 8 1 4 4 3

3 7 Checking 3 7 1 8 Checking 1 8
+ 8 Same + 1 6 + 4 3 Same + 1 4
6 1 6 1 7 5 7 5

The answer is correct. The answer is correct.

Practice Time 2G

Find the sum. Then, check your answer using the order property.
1. t O t O 2. t O t O 3. t O t O

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

4. t O t O 5. t O t O 6. t O t O

2 6 1 7 2 7
1 8 2 6 3 6

+ 2 8 + + 4 3 + + 2 8 +

46 Mathematics-2