When allowed, you can use a calculator to convert between decimals and fractions. However, for the SAT, the College Board recommends that you know the decimal equivalent of the following fractions:
The bar notation indicates that the 3 and the 6 repeat infinitely, ie: = 0.33333 ...
Converting Repeating Decimal Numbers to Fractions
Decimal numbers with an infinitely repeating sequence of digits after the decimal point can be converted into fractions. This chapter explains why.
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