12/1 Warm-Up: Multiplying Fractions

Multiplying Fractions by Fractions

Multiplying Fractions

• 3/5

• In the fraction above, the top number is called the numerator

• The bottom number is called the denominator

• These are important terms to remember because you will hear them a lot when multiplying and dividing fractions.

Multiplying Fractions

• The first step in multiplying fractions is to multiply the two numerators

• For example, you would multiply 2x2 to get 4 as your new numerator

• Next, you multiply both denominators, 3x5, to get 15 as your new denominator

• Your new fraction should now be 4/15

Multiple Choice

What is the first step when you multiply fractions?

• Multiply the denominators

• Multiply the numerators

• Neither

Multiple Choice

What is the second step when you multiply fractions?

• Multiply the numerators

• Multiply the denominators

• Neither

Multiple Choice

Let's Practice! Remember to multiply straight across!  $$\frac{3}{5\ }\ \times\ \frac{1}{2}$$  

• 3/7

• 4/7

• 3/10

• 3/25

Fill in the Blanks

$\frac{3}{5}\ \times\ 10$  

Fill in the Blanks

 Let's try another! $\frac{6}{9}\ \times\ \frac{3}{6}$

Fill in the Blanks

$\frac{2}{3}\ \times\ 5$  

Remember, you can turn your whole number (5) into a fraction by placing a one underneath it and then multiplying. 

Fill in the Blanks

$\frac{3}{5}\ \times\ 4$  

Fill in the Blanks

$\frac{1}{2}\ \times\ \frac{3}{7}$  

Fill in the Blanks

$5\ \times\ \frac{1}{8}$  

Fill in the Blanks

$\frac{7}{9}\ \times\ \frac{1}{2}$  

Fill in the Blanks

$\frac{4}{9}\ \times\ \frac{2}{3}$