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Type the sum obtained on adding the following decimals. 
1. 2.3 + 4.7 Answer: 7.0 23 + 47 = 70
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 2.3 + 4.7 = 7.0
2. 17.5 + 28.4 Answer: 45.9 175 + 284 = 459
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 17.5 + 28.4 = 45.9
3. 0.23 + 0.12 Answer: 0.35 23 + 12 = 35
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 0.23 + 0.12 = 0.35
4. 3.57 + 4.25 Answer: 7.82 357 + 425 = 782
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 3.57 + 4.25 = 7.82
5. 44.58 + 31.35 Answer: 75.93 4458 + 3135 = 7593
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 44.58 + 31.35 = 75.93
Try the Quiz : Arithmetic Homework Help : Decimal Addition
