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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 them.

(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 it for subtracting 3-digit numbers.
example 1: Subtract 246 from 793.

Solution: First write the numbers in columns according to the place value and
then subtract.

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

Since, 3 < 6, so regroup. 8 tens are left.

9 tens + 3 ones So, 8 – 4 = 4 tens
= 8 tens + 13 ones H t O

Now, 13 – 6 = 7 ones 8 13

H t O 7 9 3

8 13 – 2 4 6
7 9 3 4 7
– 2 4 6
7

78 Mathematics-2