Page 55 - Math Genius C2

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\ 26-Sep-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

Subtracting a number from itself
When we subtract a number from itself, the difference is 0.

(a) 15 – 15 = 0 (b) 28 – 28 = 0 (c) 79 – 79 = 0

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MAths connect Collaborative Learning
Makar Sankranti is one of the most popular festivals
in India. Children celebrate it as Kite Flying Day. Some 6–1 17–0 16–9

kites are flying in the sky. Each kite has a subtraction
problem. Solve the problems and note their answers. If 21–10 15–15
the answer is 0, the kite will come down, else it goes

up.

Now, write the number of kites:

Going up = Coming down =

SUBTRACTION ON The NUmBeR lINe

Daisy and Bela need to colour some chart paper with Math Insight

different crayons. Daisy has 40 crayons. Bela takes away 13 Unlike addition, we jump
backwards while subtracting
crayons from Daisy and asks her how many crayons are left. on a number line.

Daisy calculates the remaining crayons in the following way.
Let us start from 40 and count 13 –1 –1 –1 –1 –1 –1 –1 –1 –1 –1 –1 –1 –1

steps backwards. We reach 27. Thus, 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
40 – 13 = 27.

Bela shows another way. As 13 = 10 + 3, start from 40 and take a jump of 1 ten
backwards. Then, move 3 steps backwards.

Thus, 40 – 13 = 40 – 10 – 3
= 30 – 3 = 27 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
–1 –1
–1
Hence, both find that 27 crayons are left.

Life Skills Cross-Curricular Learning

Riya is counting her body parts. Solve the subtraction sum and know how many
parts she counts.
1. I have 20 – 10 = __ fingers. 2. I have 8 – 4 = __ limbs. 3. I have 30 – 29 = __ nose.
4. I have 19 – 09 = __ toes. 5. I have 5 – 3 = __ elbows. 6. I have 33 – 31 = __ eyes.

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