Monday, September 20, 2010

Decimal to fraction

 In this lesson, we're going to learn changing decimals to fraction. Changing decimal to fraction is quite easy because I shown the special fraction 1/10, 1/100, 1/1000 etc so it's easy when you're using these special fractions. 

  For example,  "Change the following decimals to fractions, simplify if is necessary."
  (a) 0.5  (b) 0.47  (c) 0.234  (d) 6.7 (e) 0.089

 In question (a), 0.5 has only one decimal point, so 0.5 equals to 5/10.
Then we simplify and the answer is 1/2.

 Question (b) has two decimal point, so we place 47 over 100 and it's 47/100.
This time we don't need to simplify it because there's no same number to divide by.


 Question (c) has three decimal points, so we place 234 over 1000.
Then we simplify by the same number which is 2,
therefore the answer is 117/500.

  Question (d) has one decimal point but there is 1 figure after the decimal point.
Therefore is 6 7/10.

Lastly, question (e), it has 3 decimal point, therefore we write 89 over 1000.
Therefore our answer is 89/1000.


* When there's 1 figure in front of the decimal point, place the number over 10.
When there's 2 figure in front of the decimal point, place the number over 100.
When there's 3 figure in front of the decimal point, place the number over 1000.

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