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Practice Time 4e

1. Subtract the following.

(a) H t O (b) H t O (c) H t O (d) H t O

8 5 6 6 9 0 3 4 3 6 7 9
– 6 3 4 – 4 9 0 – 2 3 3 – 4 7 5

2. Write the numbers in columns and then subtract.

(a) 537 – 105 (b) 753 – 20 (c) 234 – 4 (d) 814 – 14

H t O H t O H t O H t O

– – – –

suBtrAction of 3-digit numBers with regrouping

regrouping Tens

We have learnt how to subtract by regrouping tens into ones for 2-digit numbers.

Let us use this to subtract 3-digit numbers.

Example 1: Subtract 246 from 793.

Solution: First write the numbers in columns according to their place value and

then subtract.

Step 1. Subtract the ones. Step 2. Subtract the tens.

Since 3 < 6, regroup. 8 tens were left.
9 tens + 3 ones = 8 tens + 13 ones So, 8 – 4 = 4 tens.

Now, 13 – 6 = 7 ones.
H t O

H t O 8 13
8 13 7 9 3

7 9 3 – 2 4 6
– 2 4 6 4 7
7

78 Mathematics-2