Page 67 - MathGenius-C1-Flipbook

E:\Working\Orange_Education\Math_Genius_1\Open_Files\Chap_4
\ 03-Oct-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

ProPertieS oF Subtraction Subtraction StorieS

Subtracting Zero (0) Example 1: There were 9 cupcakes in a basket.
Think Tank Critical Thinking
Mona has 5 apples. She ate nothing. Think about subtracting 0 from 4 cupcakes were eaten. How many
any number. Which of these is cupcakes are left?
How many apples are still with her? always true? 9

Clearly, 5. (a) The answer becomes zero. Solution: 9 – 4 = 5 – 4
(b) The answer becomes 1. Thus, 5 cupcakes are left. 5
So, 5 – 0 = 5. (c) The number remains the same.

Similarly, we have 6 – 0 = 6, 4 – 0 = 4 and so on. (d) The number becomes double. Example 2: Mala has 8 marbles. Arpita has 5 marbles.

Subtracting one (1) Who has more marbles and by how many?

Math Insight
Rakhi has 4 apples. She ate one apple. Solution: Mala :
l When we subtract
How many apples are left with her? zero from a number, Arpita : 8
the number remains – 5
Clearly, 3. the same. Thus, Mala has 3 marbles more. 3
l When we subtract 1
So, 4 – 1 = 3. from a number, the
answer is the number
Similarly, we have 8 – 1 = 7, 5 – 1 = 4 and so on. that comes just Practice time 4H
before it.
Subtracting a number from itself l When we subtract a Solve the following subtraction stories.
number from itself,
Alka had 3 apples. She ate all three. How the answer is zero (0).

many apples are left with her? 1. Ayssa’s dog had 8 puppies. Tens Ones

Clearly, 0. Ayssa gave 3 puppies to her

So, 3 – 3 = 0. friends. How many puppies are –
left with her?
Similarly, 8 – 8 = 0, 9 – 9 = 0 and so on.

Practice time 4g

Fill in the blanks. 2. Joya found 17 seashells on the beach. Tens Ones
After giving Samson some of her
1. 6 – 0 = 2. 9 – 9 = 3. 7 – 1 =
seashells, she has 7 seashells left.

4. 8 – = 8 5. 5 – = 4 6. 2 – = 0 How many seashells did she give to –
Samson?
7. – 0 = 12 8. – 1 = 15 9. – 18 = 0

Mathematics-1 65