1. Multiplying Fractions
By, Mrs. Muller

2. Numerator Denominator
Key Vocabulary
The numerator:
The top number of the fraction (the part of the whole)
The denominator:
The bottom number of the fraction (the whole)
Multiply: obtain from (a number) another that contains the first number a specified number of times.
Numerator
Denominator

3. Example of Multiplication
Means that there are two groups of 7
Another way to say it is adding the 7 together the amount of the groups: 7+7=14
So 3x7 would be 7+7+7=21, and 5x7= =35; memorizing is just quicker.
Group 1
Group 2
The answer is 14

4. Let’s take this to fractions
2x =
Let’s look at what this would look like with fraction strips: How many 1/3 tiles will you need?
Group 2
Group 1
That would mean that it would
be 1/3+1/3, which would equal
2/3.
Meaning that 2x1/3=2/3

5. One more Example
4x =
Let’s look at what this would look like with fraction strips: How many 1/5 tiles will you need?
Group 1
Group 2
Group 3
Group 4
That would mean that it would
be 1/5+1/5+1/5+1/5, which
would equal 4/5
Meaning that 4x1/5=4/5
What do you notice about multiplying fractions? What do you notice about
the numerator and denominator?

6. The Procedure Multiply the numerators together
Multiply the denominators together
Example: x

7. Let’s Practice