# Multiplying Fractions

Multiplying Fractions

Today we will learn how to multiply two or more fractions.

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Slide 1: Tekstslide
Math

In deze les zitten 21 slides, met interactieve quizzen en tekstslides.

## Onderdelen in deze les

Multiplying Fractions

Today we will learn how to multiply two or more fractions.

#### Slide 1 -Tekstslide

Multiplying fractions can be divided into 3 steps
1. Multiply the numerators
2. Multiply the denominators
3. Simply the new fraction

#### Slide 2 -Tekstslide

Multiplying fractions can be divided into 3 steps
1. Multiply the numerators
2. Multiply the denominators
3. Simply the new fraction

Unlike adding or subtracting fractions, we do not have to find a common denominator when multiplying.

#### Slide 3 -Tekstslide

Let's look at an example.
Solve :

Step 1. Multiply the numerators

3143

#### Slide 4 -Tekstslide

What part of the fraction is the numerator?

#### Slide 5 -Open vraag

Step 1. Multiply the numerators
Solve:

Our numerators are 3 and 1.

So, we have:

3143
13=3
3143=[?]3

#### Slide 6 -Tekstslide

Step 2. Multiply the denominators
Solve:

Our denominators are 3 and 4.

3143

What is 3 4?
A
20
B
16
C
12
D
17

#### Slide 8 -Quizvraag

Step 2. Multiply the denominators
Solve:

Our denominators are 4 and 4.

So now we have the fraction:

3143
34=12
3143=123

#### Slide 9 -Tekstslide

Solve:
Step 1. Multiply the numerators:
Step 2. Multiply the denominators:

This gives us the fractions:

3143
13=3
34=12
123

#### Slide 10 -Tekstslide

Step 3. Simply the new fraction
To simplify          we need to find the largest common factor of 3 and 12.
123

#### Slide 11 -Tekstslide

What is the largest common factor of 3 and 12?
A
1
B
3
C
36
D
No common factors

Factors of 3
Factors of 12
1
2
3
1
3
4
6
12
7
9
8

#### Slide 13 -Sleepvraag

Step 3. Simply the new fraction
To simplify         we must find the largest common factor of 3 and 12.

Their largest common factor is 3:                       and

This gives us the fraction

123
3÷3=1
12÷3=4
41

#### Slide 14 -Tekstslide

So this means that
Let's review:
Step 1. Multiply the numerators:

Step 2. Multiply the denominators:

Step 3. Simply the new fraction:

3143=41
13=3
34=12
123÷3=41

Solve:

3262
A
188
B
94
C
121
D
92

#### Slide 16 -Quizvraag

Now let's solve it together!

Step 1: Multiply the numerators:

Step 2: Multiply the denominators:

Step 3: Simply the new fraction:
3262
22=4
36=18
184

#### Slide 17 -Tekstslide

Step 3. Simplify the new fraction:
Let's list the factors of 4 and 18

• Factors of 4: 1, 2, 4

• Factors of 18: 1, 2, 3, 6, 9, 18

There largest common factor is: 2 2
184

#### Slide 18 -Tekstslide

Step 3: Simply the new fraction:
Now we divide 4 and 18 by 2:

184
4÷2=2

18÷2=?

#### Slide 20 -Open vraag

Step 3: Simply the new fraction:
Now we divide 4 and 18 by 2:
and

This gives us:

So,
184
4÷2=2
18÷2=9
92
3262=92