Page 47 - Math Genius C2

E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_02
\ 26-Sep-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

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 Tank Critical Thinking

example 2: Find 6 + 7 + 6. Write the sum of the
given magic triangles in
Solution: First add the same numbers to get the the circle.
double. Then add the sum to the third 3

number. 1.

t O 4 3

6 t O 4
7 + 12 1 2 12 + 7 = 19 2.
+ 6 + 7 4 6

1 9 5

Thus, 6 + 7 + 6 = 19. 3.

2 8
Practice Time 2F

1. Circle ( ) the pair of numbers that add up 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 if the following sums are equal.

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

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

Mathematics-2 45