Page 79 - Math Genius C2

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Let us arrange the numbers in columns of ones, tens and hundreds. Then subtract

starting from the ones place.

Step 1. First, subtract Step 2. Next, subtract Step 3. Then, subtract the

the ones. the tens. hundreds.
5 – 2 = 3 ones 4 – 2 = 2 tens 8 – 6 = 2 hundreds

H t O H t O H t O

8 4 5 8 4 5 8 4 5
– 6 2 2 – 6 2 2 – 6 2 2

3 2 3 2 2 3

Thus, 845 – 622 = 223.

That is, `223 is left in Amrita’s mobile wallet Knowledge Desk

now. A digital payment is a way of

Let us look at some more examples. transferring money
from one payment
Example 1: Subtract the following. account to another Cross-Curricular Learning
using a digital device
(a) 324 – 112 like a smartphone.

(b) 750 – 300

Solution: (a) H t O (b) H t O

3 2 4 7 5 0
– 1 1 2 – 3 0 0
2 1 2 4 5 0

Thus, 324 – 112 = 212. Thus, 750 – 300 = 450.

Example 2: Subtract 472 – 22 by writing in columns.

Solution: We write the smaller number below the greater number and subtract

starting from the ones place.

H t O Get it right!

4 7 2 Subtract 4 from 578.
– 2 2 H T O H T O
5 7 8
5 7 8
4 5 0 – 4 – 4
Thus, 472 – 22 = 450. 1 7 8 7 5 7 4 3

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