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Addition of three 3-digit numbers

Adding three 3-digit numbers is the same as the addition of two 3-digit numbers.

Let us add 217 + 342 + 153. Arrange the numbers in place value columns and follow the

given steps:
Step 1: Add the ones. H t O

7 + 2 + 3 = 12 ones = 1 ten + 2 ones. 1 1

Write 2 in ones column and carry over 1 ten in the tens column. 2 1 7
Step 2: Add the tens. 3 4 2
+ 1 5 3
1 (carried over) + 1 + 4 + 5 = 11 tens = 1 hundred + 1 ten. 7 1 2

Write 1 in the tens column and carry over 1 hundred in the
hundreds column.
Step 3: Add the hundreds.

1 (carried over) + 2 + 3 + 1 = 7 hundreds.

Write 7 in the hundreds column.
Thus, 217 + 342 + 153 = 712.

Think and Answer
Find the missing numbers in the blocks of addition 182
pyramid.
Hint: Each block except the bottom row has the sum 48
of the two numbers below it. 20 26 22 18

practice time 2B

1. Add the following and tell at which place will you need regrouping in the following
addition.

(a) H t O (b) H t O (c) H t O
7 0 9 5 2 3 7 8 5
+ 1 0 4 + 1 8 3 + 1 1 5

2. Find the sum of the following.
(a) H t O (b) H t O (c) H t O

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

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