Page 94 - Revised Maths Wisdom Class - 1

92 MATHS

Subtraction using Regrouping/Borrowing

Let us subtract 18 from 45.

T O 1 ten 1 ten

4 5 1 ten 1 ten

5 ones 15 ones

1 ten
– 1 8

8 ones
2 7 15 – 8

3 – 1

Let us learn how to borrow and subtract.
Step 1: Check digit at ones place.

T O Since 5 < 8, borrow 1 ten from 4 tens.
Step 2 3 15 Step 1 Borrowed 1 ten = 10 ones.

4 5 10 ones + 5 ones = 15 ones.

– 1 8 Step 2: Change the tens place from 4 to 3.
Step 3: Subtract ones place now.
2 7
We get, 15 – 8 = 7
Step 4: Subtract the tens column now.

We get, 3 – 1 = 2
Step 4 Step 3
So, 45 – 18 = 27

Subtraction by using Counters
Let us take an example to subtract 19 and 47.

Tens Ones

–
= 10 = 1 + = 0
+ + + + +
+ + + + 47
+ +

– – – – –
– 19
– – – –