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Arithmetic Homework Help : Decimal Addition

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Type the sum obtained on adding the following decimals.

1.    2.1
+ 1.7
Answer: 3.8
 21  + 17  = 38 
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 2.1 + 1.7 = 3.8 


2.    38.7
+ 25.2
Answer: 63.9
 387  + 252  = 639 
There is 1 decimal place in the numbers being added.
So the sum must have 1 decimal place.
Thus, 38.7 + 25.2 = 63.9 


3.    0.37
+ 0.36
Answer: 0.73
 37  + 36  = 73
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 0.37  + 0.36 = 0.73



4.    4.02
+ 1.78
Answer: 5.8
 402  + 178  = 580 
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 4.02 + 1.78 = 5.8


5.    36.74
+ 45.75
Answer: 82.49
 3674 + 4575 = 8249
There are 2 decimal places in the numbers being added.
So the sum must have 2 decimal places.
Thus, 36.74  + 45.75  = 82.49


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