Arithmetic Homework Help : Decimal Addition

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Type the sum obtained on adding the following decimals.

1. 3.9
+ 4.2

Answer: 8.1

39 + 42 = 81
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 3.9 + 4.2 = 8.1

2. 31.1
+ 29.9

Answer: 61.0

311 + 299 = 610
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 31.1 + 29.9 = 61.0

3. 0.24
+ 0.23

Answer: 0.47

24 + 23 = 47
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 0.24 + 0.23 = 0.47

4. 2.28
+ 2.3

Answer: 4.58

228 + 230 = 458
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 2.28 + 2.3 = 4.58

5. 10.30
+ 37.13

Answer: 47.43

1030 + 3713 = 4743
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 10.30 + 37.13 = 47.43