Page 101 - Math - 1

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 8 1 ten

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

2 7 Step 2: Change the tens place from 4 to 3.

Step 3: Subtract ones place now.

Step 4 Step 3
We get, 15 – 8 = 7

Step 4: Subtract the tens column now.

We get, 3 – 1 = 2

So, 45 – 18 = 27

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