Multiplying Fractions Review

Multiplying Fractions Review

Topic 8

Multiply a Fraction by a Whole Number

Remember: When multiplying a fraction by a whole number, you must change the whole number to a fraction.

Multiple Choice

How do you change a whole number to a fraction?

• You use the numerator as the denominator

• Make the denominator "1"

• Make the denominator "0"

• Multiply the numerator by 2 and make that the denominator.

Multiple Choice

 $\frac{2}{8}\times3=$  

•  $\frac{6}{24}$  

•  $\frac{6}{8}$  

•  $\frac{2}{24}$  

Multiple Choice

 $4\times\frac{2}{10}=$  

•  $\frac{20}{4}$  

•  $\frac{8}{10}$  

•  $\frac{8}{40}$  

Multiple Choice

 $\frac{1}{12}\times10=$  

•  $\frac{10}{12}$  

•  $\frac{1}{120}$  

•  $\frac{11}{12}$  

Multipy Two Fractions

Remember: Multiply the numerator and then the denominators.

Multiple Choice

 $\frac{3}{4}\times\frac{2}{3}=$  

•  $\frac{5}{7}$  

•  $\frac{6}{12}$  

•  $\frac{8}{9}$  

Multiple Choice

 $\frac{4}{10}\times\frac{2}{3}$  

•  $\frac{8}{30}$  

•  $\frac{12}{20}$  

•  $\frac{1}{2}$  

•  $\frac{8}{12}$  

Multiple Choice

 $\frac{5}{8}\times\frac{1}{2}=$  

•  $\frac{10}{16}$  

•  $\frac{5}{16}$  

•  $\frac{5}{8}$  

•  $\frac{5}{8}$  

Multiple Choice

When solving an equation with parentheses, always solve the problem in the parentheses ___________.

• first

• last

• it doesn't matter what order you do the problem in.

Multiple Choice

 $\left(\frac{1}{4}+\frac{1}{4}\right)\times\frac{1}{2}=$  

•  $\frac{3}{10}$  

•  $\frac{3}{32}$  

•  $\frac{2}{8}$  

Multiple Choice

 $\left(\frac{1}{3}+\frac{1}{6}\right)\times\frac{3}{4}$  

•  $\frac{9}{24}$  

•  $\frac{6}{36}$  

•  $\frac{5}{24}$  

Area of a Rectangle

Remember: add "square" to your product

Multiple Choice

When you multiple inches by inches, your product is in...

• inches

• feet

• square inches

Multiple Choice

Find the area of a square
with side lengths of

 $\frac{3}{8}$  inch.

•  $\frac{3}{8\ }square\ inches$  

•  $\frac{9}{24}square\ inches$  

•  $\frac{12}{32}square\ inches$  

•  $\frac{9}{64}\ square\ inches$  

Multiply Mixed Numbers

Remember: Before you can multiple a mixed number, you need to change it to an improper fraction!

Multiple Choice

What is the first step when multiplying mixed numbers?

• You change the mixed number into an improper fraction

• Multiply the numerators

• Multiply the denominators

Multiple Choice

When changing a mixed number to an improper fraction, how do you get the numerator?

• You keep it the same

• Multiply the denominator and whole number, then add the numerator

• Add the whole number, denominator and numerator together

Multiple Choice

When changing a mixed number to an improper fraction, what happens to the denominator?

• It stays the same

• Multiply it by the whole number

• Add it to the numerator and then subtract the whole number

Multiple Choice

 $1\ \frac{2}{3}\times3\ \frac{1}{2}=$  

•  $3\ \frac{2}{6}$  

•  $\frac{35}{5}$  

•  $\frac{2}{6}$  

Multiple Choice

 $2\ \frac{1}{4}\ \times\ 1\ \frac{2}{5}=$  

•  $3\ \frac{2}{20}$  

•  $\frac{72}{20}$  

•  $\frac{9}{7}$  

Multiplication as Scaling

Multiple Choice

 $\frac{2}{3}\$  _____ $\frac{2}{3}\times\frac{2}{2}$  

• >

• <

• =

Multiple Choice

 $\frac{1}{2}$  ____ $\frac{1}{2}\times2\ \frac{1}{3}$  

• <

• >

• =

Multiple Choice

 $\frac{3}{4}_{ }$  ____ $\frac{3}{4}\times\frac{1}{2}$  

• >

• <

• =