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regrouping both Hundreds and tens
If there are not enough ones and tens in minuend, we regroup both hundreds and tens.
Example 3: Subtract 267 from 421.

Solution: Write the numbers in columns and follow the given steps:
Step 1: Subtract the ones. Step 2: Subtract the tens. Step 3: Subtract
Since 1 < 7, regroup tens Since 1 < 6. So, regroup the hundreds.
and ones. hundreds and tens. 3 hundreds –
2 tens 1 one = 1 ten 11 4 hundreds 1 ten 2 hundreds
ones. = 3 hundreds 11 tens = 1 hundred
Now, 11 ones – 7 ones Now, 11 tens – 6 tens

= 4 ones = 5 tens

H t O H t O H t O
1 11 11 11
4 2 1 3 1 11 3 1 11

– 2 6 7 4 2 1 4 2 1
– 2 6 7 – 2 6 7
4
5 4 1 5 4
Thus, 421 – 267 = 154

Subtraction with Zeros

Example 4: Subtract 268 from 500.
Solution: Write the numbers in columns and follow the given steps:
Step 1: Subtract the ones.
Since, 8 cannot be subtracted from 0. So, regroup H t O

tens and ones. But there are no tens. So, first regroup 9
hundreds and tens and then tens and ones. 4 10 10
5 hundreds 0 tens = 4 hundreds 10 tens 5 0 0
Again, 10 tens = 9 tens 10 ones – 2 6 8

Now, 10 ones – 8 ones = 2 ones 2
Step 2: Subtract the tens. Step 3: Subtract the hundreds.
9 tens – 6 tens = 3 tens 4 hundreds – 2 hundreds = 2 hundreds

H t O H t O
9 9 Knowledge Desk

4 10 10 4 10 10 Aryabhatta, an
5 0 0 5 0 0 astronomer and
mathematician of
– 2 6 8 – 2 6 8 India who introduced
3 2 2 3 2 'zero' in the 5th century.
Thus, 500 – 268 = 232

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