 # Converting Rational Numbers to Fractions

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Converting Rational Numbers to Fractions
Math Notebook & Pencil

Steps Step 1: Let x equal the repeating decimal you are trying to convert to a fraction Step 2: Examine the repeating decimal to find the repeating digit(s) Step 3: Place the repeating digit(s) to the left of the decimal point

Steps Cont. Step 4: Place the repeating digit(s) to the right of the decimal point Step 5: Subtract the left sides of the two equations.Then, subtract the right sides of the two equations As you subtract, just make sure that the difference is positive for both sides

Example What rational number or fraction is equal to 0.55555555555?
Step 1: x =   Step 2: After examination, the repeating digit is 5 Step 3: To place the repeating digit ( 5 ) to the left of the decimal point, you need to move the decimal point 1 place to the right

Technically, moving a decimal point one place to the right is done by multiplying the decimal number by When you multiply one side by a number, you have to multiply the other side by the same number to keep the equation balanced Thus, 10x =

Step 4 Place the repeating digit(s) to the right of the decimal point Look at the equation in step 1 again. In this example, the repeating digit is already to the right, so there is nothing else to do. x =

Step 5 Your two equations are: 10x =    x = x - x = − x = 5 Divide both sides by 9 x = 5/9

Example #2 What rational number or fraction is equal to 1.04242424242
Step 1: x =   Step 2: After examination, the repeating digit is 42

Why 3 places? Step 3: To place the repeating digit ( 42 ) to the left of the decimal point, you need to move the decimal point 3 place to the right

Why Miss Greger? Again, moving a decimal point three place to the right is done by multiplying the decimal number by When you multiply one side by a number, you have to multiply the other side by the same number to keep the equation balanced Thus, 1000x =

Step 4 Place the repeating digit(s) to the right of the decimal point In this example, the repeating digit is not immediately to the right of the decimal point. Look at the equation in step 1 one more time and you will see that there is a zero between the repeating digit and the decimal point To accomplish this, you have to move the decimal point 1 place to the right

Step 5 Your two equations are: x =    10x = x - 10x = − x = Divide both sides by x = 1032/990

Try by yourself