Page 38 - Revised Maths Wisdom Class - 2

36 MATHS

Tripti had 49 marbles. She gave Rahul 17 of
them. How many marbles does she have

now?

Answer: She has __________ marbles now.

R Remember!emember!emember!
R
› Words such as subtract, minus, take away, decrease, take from, reduce, fewer,
left indicate subtraction.

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 in ones column. T O
Since 5 < 8, borrow 1 ten from 4 tens. 3 15

Borrowed 1 ten = 10 ones 4 5

10 ones + 5 ones = 15 ones – 1 8

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

Step 3: Subtract ones column now. Step 4: Subtract the tens column now.

We get, 15 – 8 = 7 We get, 3 – 1 = 2

So, 45 – 18 = 27