# 1TTO §8.5 multiplying fractions

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This lesson contains 28 slides, with interactive quizzes and text slides.

Lesson duration is: 30 min

## Items in this lesson

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#### Slide 1 -Slide

§8.5 Multiplying fractions
After   +       and        -     we now look at
the operation:       x   !
By the way, this is a pretty long LessonUp.

#### Slide 2 -Slide

First we multiply a fraction by a whole number:

#### Slide 4 -Slide

D

Do:  2 X 33 : 3 = .......

32
x 33 = ...

solution:
2

#### Slide 7 -Slide

another one for you:

3/13 x 52 = ....
A
10
B
9
C
14
D
12

Solution:

#### Slide 10 -Slide

Finally it's
Fraction times Fraction ...

#### Slide 11 -Slide

2nd important point:
2. (in fact good news to some of you, who didn't know it yet!)

When multiplying fractions with unequal denominators,
you don't have to make them equal!!
Watch the next slides that show how simple it really is!

3/8 x 3/8 = ...
A
9/8
B
9/64
C
6/16
D
3/64

Solution:

#### Slide 17 -Slide

Fotovraag: work out on paper, take a pic and send in in next slide!
2nd This a task for ALL!

#### Slide 18 -Slide

2/7 + 1/7 x 1/2 = ......

Solution:

#### Slide 20 -Slide

Now it's time for a complicated one:

Think about it for a while. After that we look at the solution.

#### Slide 21 -Slide

This is the Solution:

#### Slide 22 -Slide

For example this one.                                   You might think:
2  x  3 = 6      and                 x          =

So the final answer is:        6   +        =   6                 However this is WRONG!

21
41
81
81
81

#### Slide 23 -Slide

Let's look back at the previous slide for a sec to see if both methods are good!

#### Slide 24 -Slide

again work out on paper and send it in.
This time for every-every-every one!

#### Slide 25 -Slide

1 1/8 x 1 1/3 = ......

Solution:

Homework:
§8.5 Make 8.5.