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Arithmetic Homework Help : Decimal Multiplication

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

1. 46.3 x 7 =
Answer: 324.1
463 x 7 = 3241.0
There is 1 decimal place in 46.3, so the product must have 1 decimal place.
Thus,
46.3 x 7 = 324.1


2. 4.10 x 5 =
Answer: 20.50
410 x 5 = 2050 
There are 2 decimal places in 4.10, so the product must have 2 decimal places.
Thus,
4.10 x 5 = 20.50


3. 7.51 x 6 =
Answer: 45.06
751 x 6 = 4506 
There are 2 decimal places in 7.51, so the product must have 2 decimal places.
Thus,
7.51 x 6 = 45.06



4. 84.9 x 8 =
Answer: 679.2
849 x 8 = 6792
There is 1 decimal place in 84.9, so the product must have 1 decimal place.
Thus,
84.9 x 8 = 679.2


5. 5.24 x 100 =
Answer: 524
524 x 100 = 52400
There are 2 decimal places in 5.24, so the product must have 2 decimal places.
Thus, 
5.24 x 100 = 524 = 524 
Tip: When 5.24  is multiplied by 100 , the decimal point shifts to the right byplace(s).


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