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Arithmetic Homework Help : Decimal Multiplication

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Quiz : Type the product obtained on multiplying the following decimals.

1. 49.9 x 4 =
Answer: 199.6
499 x 4 = 1996.0
There is 1 decimal place in 49.9, so the product must have 1 decimal place.
Thus,
49.9 x 4 = 199.6


2. 1.27 x 7 =
Answer: 8.89
127 x 7 = 889 
There are 2 decimal places in 1.27, so the product must have 2 decimal places.
Thus,
1.27 x 7 = 8.89


3. 5.66 x 8 =
Answer: 45.28
566 x 8 = 4528 
There are 2 decimal places in 5.66, so the product must have 2 decimal places.
Thus,
5.66 x 8 = 45.28



4. 81.6 x 3 =
Answer: 244.8
816 x 3 = 2448
There is 1 decimal place in 81.6, so the product must have 1 decimal place.
Thus,
81.6 x 3 = 244.8


5. 1.36 x 10 =
Answer: 13.6
136 x 10 = 1360
There are 2 decimal places in 1.36, so the product must have 2 decimal places.
Thus, 
1.36 x 10 = 13.6 = 13.6 
Tip: When 1.36  is multiplied by 10 , the decimal point shifts to the right byplace(s).


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