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Question 649990: Dividing decimals-----I know if you use a calculator to answer this problem it gives you 2.2. My teacher says to use mental math and no paper to do it. I know you move the decimal to the right or left depending on if you multiply or divide if you are using 10, 100, 1000, ect. But I do not understand this problem, 0.22 divided by 0.1. Thank you
Answer by MathTherapy(10552)   (Show Source):
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Dividing decimals-----I know if you use a calculator to answer this problem it gives you 2.2. My teacher says to use mental math and no paper to do it. I know you move the decimal to the right or left depending on if you multiply or divide if you are using 10, 100, 1000, ect. But I do not understand this problem, 0.22 divided by 0.1. Thank you
When dividing decimals, you first need to convert the decimal value in the denominator to a whole number. In this case, it involves moving the decimal point in 0.1, one place to the right. This gives you 1.
You then move the decimal point in the numerator value the same amount of places that you moved the decimal point in the denominator. This involves moving the decimal point in 0.22, one place to the right. This gives you 2.2. Now we have:  , which gives you:  , as any value divided by one is itself.
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