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Step 3: Subtract the remaining hundreds. H T O
9
7 – 5 = 2 8 0 2
10
7
12
Write 2 under the hundreds place.
– 5 6 4
So, 802 – 564 = 238.
2 3 8
Subtraction Facts

Let’s revise the subtraction facts by taking bigger numbers.
• If 0 is subtracted from a number, the result is the number itself.

For example, 116 – 0 = 116.
• If 1 is subtracted from a number, the result is the predecessor of that number.

For example, 243 – 1 = 242.
• If the same number is subtracted from itself, the result is 0.

For example, 511 – 511 = 0.
• The order of numbers in subtraction cannot be changed because a bigger number
cannot be subtracted from a smaller number.

For example, 823 – 463 = 360, but 463 – 823 is not possible since 463 < 823.

Mental Maths
Subtract mentally and write the answer.

(a) 115 – 115 = (b) 265 –1 = (c) 109 – 0 =

Exercise 3.2

1. Subtract the given numbers.

(a) H T O (b) H T O (c) H T O
2 7 3 8 6 2 5 9 0

– 4 5 – 3 8 – 4 1

(d) H T O (e) H T O (f) H T O
5 4 2 9 2 8 4 9 5

– 6 7 – 5 6 – 3 2 8

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