Page 35 - Start Up Mathematics_3

Addition of Two 4-Digit Numbers (without carry over)

To add 4-digit numbers, first add the ones, then the tens, the hundreds and finally
the thousands.

Example 1: Add 4302 and 2683.

Solution:
Th H T O Th H T O

4 3 0 2 Step 1: Add the 4 3 0 2 Step 2: Add the

+ 2 6 8 3 ones. + 2 6 8 3 tens.
2 + 3 = 5 0 + 8 = 8
5 8 5

Th H T O Th H T O

4 3 0 2 Step 3: Add the 4 3 0 2 Step 4: Add the

+ 2 6 8 3 hundreds. + 2 6 8 3 thousands.
3 + 6 = 9 4 + 2 = 6
9 8 5 6 9 8 5

So, 4302 + 2683 = 6985. Remember

Similarly, you can add 5-digit and bigger The numbers which are added
numbers. are called addends. For example,
in 12 + 10 = 22, 12 and 10 are
the addends and 22 is the sum.

EXERCISE 3.1

1. Add the following.

Th H T O Th H T O Th H T O
(a) (b) (c)
9 7 1 6 5 8 2 5 7 5 9 1

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

Th H T O Th H T O Th H T O
(d) (e) (f)
6 7 1 2 4 9 2 7 5 4 5 4

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

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