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Read the whole thing through first to make any sense. I hope it helps you.

If the decimal is non-repeating: divide the number over 100.

Ex. 0.5= 50/100= 1/2= 0.5, .25= 25/100= 1/4= 0.25, .375= 375/1000= 3/8= 0.375

always have at least two numbers over 100, 0.5= 50/100, and have the same number of digits as the decimal, .375=375, but it has to be over 1000 because there has to be one more digit on the bottom number (denominator) than the top number (numerator).

If the decimal is repeating: divide the number over 99.

Ex. 0.3 repeating= 33/99= 1/3= 0.3 repeating, 0.45 repeating= 45/99= 5/11= 0.45 repeating, 0.142857 repeating= 142857/999999= 1/7= 0.142857 repeating.

always have at least two numbers over 99, 0.3= 33/99, and have the same number of digits as the decimal, 142857/999999, but it has to be over 999999 (6 9's) because there has to be the same number of digits on the bottom number (denominator) and on the top number (numerator).

The two options I have explained only work to a certain extent. A regular calculator will not convert a decimal to a fraction. You will have to work it out by hand from the two ways I have explained.

If you have a TI-34 II and maybe only some other certain calculators, type the decimal in and type the fraction button, and it will tell you the fraction in lowest terms.

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Q: How do you turn a decimal into a fraction using the calculator?
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