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Arithmetic Homework Help : Decimal Multiplication

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


1. 22.2 x 8 =
Answer: 177.6
222 x 8 = 1776.0
There is 1 decimal place in 22.2, so the product must have 1 decimal place.
Thus,
22.2 x 8 = 177.6

2. 2.12 x 7 =
Answer: 14.84
212 x 7 = 1484 
There are 2 decimal places in 2.12, so the product must have 2 decimal places.
Thus,
2.12 x 7 = 14.84

3. 6.02 x 3 =
Answer: 18.06
602 x 3 = 1806 
There are 2 decimal places in 6.02, so the product must have 2 decimal places.
Thus,
6.02 x 3 = 18.06


4. 59.8 x 5 =
Answer: 299.0
598 x 5 = 2990
There is 1 decimal place in 59.8, so the product must have 1 decimal place.
Thus,
59.8 x 5 = 299.0

5. 5.08 x 100 =
Answer: 508
508 x 100 = 50800
There are 2 decimal places in 5.08, so the product must have 2 decimal places.
Thus, 
5.08 x 100 = 508 = 508 
Tip: When 5.08  is multiplied by 100 , the decimal point shifts to the right byplace(s).

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