Page 64 - Math Genius C2

E:\Working\Orange_Education\Math_Genius_2\Open_Files\Chap_03
\ 26-Sep-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

FINDING The mISSING NUmBeR

example 1: What should be added to 5 to get 13?
Solution: We have 5 + _____ = 13

We can figure out the missing number by thinking about a subtraction
fact in the same family.

Think 13 – 5 = _____

We know that 13 – 5 = 8 and we also know that 5 + 8 = 13.
So, 8 should be added to 5 to get 13.

example 2: What should be subtracted from 16 to get 9?

Solution: We have 16 – _____ = 9
Since 16 – 9 = 7, we know that 16 – 7 = 9.

So, 7 should be subtracted from 16 to get 9.

activity Logical Thinking
Experiential Learning
Count the dots on the given cards. then draw the missing dots to
complete the fact.

1. – = 2. – =

3. – = 4. – + =

Practice Time 3F

1. Complete the addition facts using a related subtraction fact.

(a) 9 + _____ = 14 (b) 7 + _____ = 13 (c) 11 + _____ = 17

(d) 14 + _____ = 17 (e) _____ + 8 = 14 (f) _____ + 14 = 36

2. Complete the subtraction facts using a related addition fact.

(a) _____ – 3 = 6 (b) _____ – 8 = 9 (c) _____ – 10 = 14

(d) _____ – 8 = 13 (e) _____ – 4 = 9 (f) _____ – 19 = 24

3. Complete the subtraction facts using a related subtraction fact.

(a) 17 – _____ = 9 (b) 13 – _____ = 8 (c) 14 – _____ = 10

(d) 20 – _____ = 12 (e) 28 – _____ = 21 (f) 26 – _____ = 19

62 Mathematics-2