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Arithmetic Homework Help : Decimal Multiplication

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


1. 12.1 x 4 =
Answer: 48.4
121 x 4 = 484.0
There is 1 decimal place in 12.1, so the product must have 1 decimal place.
Thus,
12.1 x 4 = 48.4

2. 1.44 x 5 =
Answer: 7.20
144 x 5 = 720 
There are 2 decimal places in 1.44, so the product must have 2 decimal places.
Thus,
1.44 x 5 = 7.20

3. 6.41 x 3 =
Answer: 19.23
641 x 3 = 1923 
There are 2 decimal places in 6.41, so the product must have 2 decimal places.
Thus,
6.41 x 3 = 19.23


4. 86.9 x 6 =
Answer: 521.4
869 x 6 = 5214
There is 1 decimal place in 86.9, so the product must have 1 decimal place.
Thus,
86.9 x 6 = 521.4

5. 6.41 x 100 =
Answer: 641
641 x 100 = 64100
There are 2 decimal places in 6.41, so the product must have 2 decimal places.
Thus, 
6.41 x 100 = 641 = 641 
Tip: When 6.41  is multiplied by 100 , the decimal point shifts to the right byplace(s).

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