Multiplying Fractions

Multiplying 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

Simplifying your answer

• Sometimes when you multiply fractions the answer you get will not be in simplest form.

• It is your job to simplify the fraction.

• Ex: 6/24=1/4

• The student knew that you could divide both 6 and 24 by 6.

• 
  

   $6\div6=1$   $24\div6=4$  

• That's how you simplify a fraction.

Poll

Does this make sense so far?

• Yes

• No

• Sort of

Let's try practicing simplifying fractions again

Multiple Choice

What is the fraction 2/4 in simplest form?

• 1/2

• 1/4

• 2/2

• It is in simplest form

2/4 in simplest form is 1/2

• When simplifying fractions you have to find the greatest common factor

• That means the largest number that you can divide both the numerator and denominator by.

• You can divide both 2 and 4 by 2

•  $2\div2=1$   $4\div2=2$  

• That is how you get 1/2

Great job guys! Please use the rest of your time to do the practice problems on the worksheet!