Page 26 - Fun with Mathematics 2

ADDITION WITH THREE ADDENDS (WITH REGROUPING)

Add 235, 306 and 315.

Step 1. Add the ones digits.
H T O 5 ones + 6 ones + 5 ones = 16 ones
1
2 3 5 Regroup 16 ones as 1 ten + 6 ones.

3 0 6 Write 6 ones under the ones (O) column.
Carry over 1 to the tens (T) column.
+ 3 1 5 Step 2. Add the tens digits.

8 5 6 1 ten (carried over) + 3 tens + 1 ten = 5 tens
Write 5 under the tens (T) column.
Step 3. Add the hundreds digits.
2 hundreds + 3 hundreds + 3 hundreds = 8 hundreds
Write 8 under the hundreds (H) column.

The sum of 235, 306 and 315 is 856.

5 Find the sum.

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

5 3 6 8 7 9 8 4

3 4 2 2 6 4 2 4 6 2 0 3
+ 4 0 1 + 2 3 3 + 6 0 1 + 3 7 6

(e) H T O (f) H T O (g) H T O (h) H T O
2 8 6 4 2 6 3 1 6 3 4 5

1 1 3 2 3 7 3 8 6 1 2 2

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

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

4 7 9 2 1 6 2 6 2 1 7 5
2 9 3 3 8 0 2 6 4 3 0 3

+ 1 0 5 + 1 7 9 + 2 3 2 + 2 2 8

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