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Arithmetic Homework Help : Decimal Subtraction

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Quiz : Type the difference obtained on subtracting the following decimals.

1.    3.9
− 2.1
Answer: 1.8
39 − 21 = 18
There is 1 decimal place in the numbers being subtracted.
So the difference must have 1 decimal place.
Thus, 3.9 − 2.1 = 1.8


2.    47.2
− 22.3
Answer: 24.9
 472 − 223 = 249 
There is 1 decimal place in the numbers being subtracted.
So the difference must have 1 decimal place..
Thus, 47.2 − 22.3 = 24.9


3.    0.32
− 0.11 
Answer: 0.21
32 − 11 = 21 
There are 2 decimal places in the numbers being subtracted.
So the difference must have 2 decimal places.
Thus, 0.32 − 0.11 = 0.21



4.    2.91
− 1.03
Answer: 1.88
291 − 103 = 188 
There are 2 decimal places in the numbers being subtracted.
So the difference must have 2 decimal places.
Thus, 2.91 − 1.03 = 1.88


5.    56.80
− 34.00
Answer: 22.80
5680 − 3400 = 2280 
There are 2 decimal places in the numbers being subtracted.
So the difference must have 2 decimal places.
Thus, 56.80 − 34.00 = 22.80


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