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Arithmetic Homework Help : Decimal Multiplication

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

1. 34.2 x 7 =
Answer: 239.4
342 x 7 = 2394.0
There is 1 decimal place in 34.2, so the product must have 1 decimal place.
Thus,
34.2 x 7 = 239.4


2. 2.27 x 2 =
Answer: 4.54
227 x 2 = 454 
There are 2 decimal places in 2.27, so the product must have 2 decimal places.
Thus,
2.27 x 2 = 4.54


3. 9.81 x 5 =
Answer: 49.05
981 x 5 = 4905 
There are 2 decimal places in 9.81, so the product must have 2 decimal places.
Thus,
9.81 x 5 = 49.05



4. 78.7 x 6 =
Answer: 472.2
787 x 6 = 4722
There is 1 decimal place in 78.7, so the product must have 1 decimal place.
Thus,
78.7 x 6 = 472.2


5. 9.87 x 10 =
Answer: 98.7
987 x 10 = 9870
There are 2 decimal places in 9.87, so the product must have 2 decimal places.
Thus, 
9.87 x 10 = 98.7 = 98.7 
Tip: When 9.87  is multiplied by 10 , the decimal point shifts to the right byplace(s).


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