SSAT Middle Level Math : How to subtract fractions

Study concepts, example questions & explanations for SSAT Middle Level Math

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Example Questions

Example Question #224 : Build Fractions From Unit Fractions

Solve the following: 

\displaystyle 43\frac{5}{9}-37\frac{4}{9}

Possible Answers:

\displaystyle 6\frac{2}{9}

\displaystyle 7\frac{1}{9}

\displaystyle 6\frac{1}{9}

\displaystyle 6\frac{1}{8}

\displaystyle 7\frac{1}{8}

Correct answer:

\displaystyle 6\frac{1}{9}

Explanation:

When we subtract mixed numbers, we subtract whole numbers by whole numbers and fractions by fractions. 

\displaystyle 43-37=6

\displaystyle \frac{5}{9}-\frac{4}{9}=\frac{1}{9}

Remember, when we are subtracting fractions we must have common denominators and we only subtract the numerators. 

Example Question #592 : Number & Operations: €”Fractions

A baker used \displaystyle \frac{1}{7} of a pound of sprinkles and \displaystyle \frac{6}{7} of a pound of icing when decorating a cake. How much more icing than sprinkles did the baker use, in pounds?

Possible Answers:

\displaystyle \frac{4}{7}

\displaystyle \frac{5}{7}

\displaystyle \frac{2}{7}

\displaystyle \frac{3}{7}

\displaystyle \frac{6}{}7

Correct answer:

\displaystyle \frac{5}{7}

Explanation:

The phrase, "how much more" tells as that we want to find the difference, so we subtract. 

\displaystyle \frac{6}{7}-\frac{1}{7}=\frac{5}{7}

5 7

Example Question #111 : How To Subtract Fractions

Shannon has painted \displaystyle \frac{5}{8} of the house and Dan has painted \displaystyle \frac{1}4{} of the house. How much more of the house has Shannon painted?

Possible Answers:

\displaystyle \frac{3}{8}

\displaystyle \frac{3}4{}

\displaystyle \frac{5}7{}

\displaystyle \frac{1}4{}

\displaystyle \frac{9}{11}

Correct answer:

\displaystyle \frac{3}{8}

Explanation:

\displaystyle \frac{5}{8}-\frac{1}{4}

In order to solve this problem, we first need to make common denominators. 

\displaystyle \frac{1}{4}\times\frac{2}{2}=\frac{2}{8}

Now that we have common denominators, we can subtract the fractions. Remember, when we subtract fractions, the denominator stays the same, we only subtract the numerator. 

\displaystyle \frac{5}{8}-\frac{2}{8}=\frac{3}{8}

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