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Step 3: Add the hundreds. H t O

6 + 3 = 9 hundreds 1
Write 9 in the hundreds column. 6 2 9

Thus, 629 + 353 = 982. + 3 5 3
9
8
2
example 1: Add 324 and 256.

Solution: Write the numbers in place value columns and add using the following steps:

Step 1: Add the ones.

4 + 6 = 10 ones H t O
Regroup 10 ones as 1 ten 0 ones. 1
3
Write 0 in the ones column and carry + 2 2 4
6
5
over 1 to the tens column.
0

Step 2: Add the tens
1 (carried over) + 2 + 5 = 8 tens H t O

Write 8 in the tens column. 1
3 2 4
+ 2 5 6
8 0

Step 3: Add the hundreds

3 + 2 = 5 hundreds H t O
Write 5 in the hundreds column. 1

Thus, 324 + 256 = 580 3 2 4
+ 2 5 6
5 8 0

Addition of 3-digit numbers by regrouping tens

When we have more than 9 tens, say 12 tens, we can regroup 12 tens into 1 hundred
and 2 tens.

12 tens 1 hundred 2 tens

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