Numbers & Operations
Decimals
A decimal is a fraction that’s been churned through your calculator. If you take any fraction and divide the numerator by the denominator, what comes out is a decimal equivalent to the starting fraction:
The decimal value 0.625 is the same as . It’s another way of writing a part to a whole. On the SAT, flipping between fractions and decimals is a handy skill. You’ve seen how to change a fraction to a decimal. To change a decimal to a fraction, follow the three steps below.
  1. Remove the decimal point and make the decimal number the numerator.
If we start with 0.862, we place the 862 in the numerator:
  1. Let the denominator be the number 1, followed by as many zeroes as there are decimal places after the decimal point.
There are three decimal places after the zero in 0.862, so we’ll want to put three zeroes after the 1:
  1. Reduce the fraction.
Find a common factor and reduce the number:
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