Page 25 - Fun with Mathematics 2

3-DIGIT ADDITION (WITH REGROUPING)

Add 739 and 176.

Step 1. Add the ones digits.
H T O 9 ones + 6 ones = 15 ones
1
1
7 3 9 Regroup 15 ones as 1 ten + 5 ones.
+ 1 7 6 Write 5 under the ones (O) column.
Carry over 1 to the tens (T) column.
9 1 5 Step 2. Add the tens digits.

1 ten (carried over) + 3 tens + 7 tens = 11 tens
Regroup 11 tens as 1 hundred + 1 ten.
Write 1 under the tens (T) column.
Carry over 1 to the hundreds (H) column.
Step 3. Add the hundreds digits.

1 hundred (carried over) + 7 hundreds + 1 hundred
= 9 hundreds
Write 9 under the hundreds (H) column.
The sum of 739 and 176 is 915.

4 Find the sum.

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

4 9 1 6 4 8 3 5 6 6 4 4
+ 4 9 6 + 2 3 2 + 4 0 5 + 2 1 9

(e) H T O (f) H T O (g) H T O (h) H T O
3 6 8 4 2 6 4 2 8 1 1 7

+ 4 2 8 + 2 3 7 + 3 7 7 + 7 7 6

(i) H T O (j) H T O (k) H T O (l) H T O

5 4 5 6 9 8 7 5 7 4 7 5

+ 2 8 9 + 2 2 9 + 1 9 6 + 3 9 5

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