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example 1: Check if 2 + 7 + 6 = 7 + 2 + 6.

Solution: We can add the numbers in any order.

t O t O t O t O
2 1 7 1

7 9 Or 2 7
+ 6 + 6 + 6 + 8
1 5 1 5

Thus, 2 + 7 + 6 = 15 = 7 + 2 + 6
Think and Answer
example 2: Find 6 + 7 + 6. Write the sum of the given

Solution: First add the same numbers to get the magic triangles in the circle.
3
double. Then add the sum to the third 1.

number.
4 3
t O t O 4

6 6 2.
7 + 12 7 12 + 7 = 19
+ 6 + 6 4 6

1 9 5
3.
Thus, 6 + 7 + 6 = 19
2 8
Practice Time 2F

1. Circle ( ) the pair of numbers that add to 10. Then, add the remaining number.

(a) t O (b) t O (c) t O (d) t O

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

2. Add and check the following sums.

(a) t O t O (b) t O t O

4 2 6 3
2 4 3 6
+ 7 + 7 + 8 + 8

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