SSAT Middle Level Math : How to multiply fractions

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

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Example Questions

Example Question #301 : How To Multiply Fractions

Select the answer choice that is equal to the following: 

 \(\displaystyle 3\times\frac{2}{5}\)

Possible Answers:

\(\displaystyle 4\times\frac{2}{5}\)

\(\displaystyle 5\times\frac{2}{5}\)

\(\displaystyle 3\times\frac{1}{5}\)

\(\displaystyle 5\times\frac{1}{5}\)

\(\displaystyle 6\times\frac{1}{5}\)

Correct answer:

\(\displaystyle 6\times\frac{1}{5}\)

Explanation:

When we multiply a whole number by a fraction, we multiply the whole number by the numerator, and the denominator stays the same. 

\(\displaystyle \frac{3}{1}\times\frac{2}{5}=\frac{6}{5}\)

\(\displaystyle \frac{6}{1}\times\frac{1}{5}=\frac{6}{5}\)

Example Question #1101 : Common Core Math: Grade 5

Solve the following: 

\(\displaystyle \small \frac{3}{4}\times3\)

Possible Answers:

\(\displaystyle \small \frac{9}{4}\)

\(\displaystyle \small \frac{3}{4}\)

\(\displaystyle \small \frac{4}{9}\)

\(\displaystyle \small \frac{1}{3}\)

\(\displaystyle \small \frac{1}{2}\)

Correct answer:

\(\displaystyle \small \frac{9}{4}\)

Explanation:

\(\displaystyle \small \frac{3}{4}\times3\)

When we multiply a fraction by a whole number, we first want to make the whole number into a fraction. We do that by putting the whole number over \(\displaystyle 1.\) Then we multiply like normal. 

\(\displaystyle \small \small \frac{3}{4}\times\frac{3}{1}=\frac{9}{4}\)

Example Question #302 : How To Multiply Fractions

Solve the following:

\(\displaystyle \small \frac{1}{3}\times\frac{1}{9}\)

Possible Answers:

\(\displaystyle \small \frac{1}{28}\)

\(\displaystyle \small \frac{1}{27}\)

\(\displaystyle \small \frac{5}{27}\)

\(\displaystyle \small \frac{2}{27}\)

\(\displaystyle \small \frac{1}{6}\)

Correct answer:

\(\displaystyle \small \frac{1}{27}\)

Explanation:

When we multiply fractions, we multiply the numerator by the numerator and the denominator by the denominator. 

\(\displaystyle \small \small \frac{1}{3}\times\frac{1}{9}=\frac{1}{27}\)

Example Question #9 : Solve Word Problems Involving Multiplication Of A Fraction By A Whole Number: Ccss.Math.Content.4.Nf.B.4c

Linda is having her friends over for a game night. If each person at the game night will drink \(\displaystyle \frac{4}{5}\) of a liter of soda, and there will be \(\displaystyle 7\) people at the game night, the number of liters of soda that Linda and her friends will drink is between the numbers:

Possible Answers:

\(\displaystyle 7\) and \(\displaystyle 8\)

\(\displaystyle 5\) and \(\displaystyle 6\)

\(\displaystyle 6\) and \(\displaystyle 7\)

\(\displaystyle 4\) and \(\displaystyle 5\)

\(\displaystyle 8\) and \(\displaystyle 9\)

Correct answer:

\(\displaystyle 5\) and \(\displaystyle 6\)

Explanation:

\(\displaystyle \frac{7}{1}\times\frac{4}{5}=\frac{28}{5}\)

\(\displaystyle \frac{28}{5}=5\frac{3}{5}\) because \(\displaystyle 5\) can go into \(\displaystyle 25\) five times, with \(\displaystyle 3\) left over.

\(\displaystyle 5\frac{3}{5}\) is between the whole numbers \(\displaystyle 5\) and \(\displaystyle 6\).

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