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.
That function depends on the calculator's capabilites. Some calculators do not show fractions. They only represent fractions as a decimal value (e.g. 50% is represented in the calculator as .5). If your calculator has a fraction function, you can enter 50% then press the fraction button & it will display 1/2 (which is the lowest fraction for 50%).
By using a calculator:)
You turn a fraction into a decimal by dividing the top number by the bottom. And you turn a decimal into a percent by multiplying the decimal by 100.
Decimal percentage, move the decimal point to the right two places, and then add a percentage sign; fraction into percentage, you can first turn the fraction into a decimal, and then turn the fraction into a percentage, or you can turn the fraction into a fraction whose denominator is 100, and directly rewrite it into a percentage!
The same rules apply but it might help if you turn the fraction into a decimal.
Why do you need a calculator?
You should be familiar with long division involving decimals
you divide the numerator by the denominator
numerator (top) divided by the denominator (bottom)
That function depends on the calculator's capabilites. Some calculators do not show fractions. They only represent fractions as a decimal value (e.g. 50% is represented in the calculator as .5). If your calculator has a fraction function, you can enter 50% then press the fraction button & it will display 1/2 (which is the lowest fraction for 50%).
By using a calculator:)
long division then move the decimal point
You can add fractions if you have a scientific calculator. All you have to do is press the b/c button. If you don't have one, you could always turn the fraction into a decimal.
The only way, without a calculator, that I know of is long division.
You turn a fraction into a decimal by dividing the top number by the bottom. And you turn a decimal into a percent by multiplying the decimal by 100.
To turn a fraction into a decimal, simply divide the numerator by the denominator.
you have 2 turn the percent into a decimal the you can easily turn the decimal into a fraction