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Arithmetic Homework Help : Decimal Multiplication

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


1. 15.6 x 9 =
Answer: 140.4
156 x 9 = 1404.0
There is 1 decimal place in 15.6, so the product must have 1 decimal place.
Thus,
15.6 x 9 = 140.4

2. 4.42 x 4 =
Answer: 17.68
442 x 4 = 1768 
There are 2 decimal places in 4.42, so the product must have 2 decimal places.
Thus,
4.42 x 4 = 17.68

3. 8.02 x 6 =
Answer: 48.12
802 x 6 = 4812 
There are 2 decimal places in 8.02, so the product must have 2 decimal places.
Thus,
8.02 x 6 = 48.12


4. 66.4 x 8 =
Answer: 531.2
664 x 8 = 5312
There is 1 decimal place in 66.4, so the product must have 1 decimal place.
Thus,
66.4 x 8 = 531.2

5. 2.09 x 10 =
Answer: 20.9
209 x 10 = 2090
There are 2 decimal places in 2.09, so the product must have 2 decimal places.
Thus, 
2.09 x 10 = 20.9 = 20.9 
Tip: When 2.09  is multiplied by 10 , the decimal point shifts to the right byplace(s).

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