1TTO §8.5 multiplying fractions

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• Middelbare school
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§8.5 Multiplying fractions

After   +       and        -     we now look at

the operation:       x   !

By the way, this is a pretty long LessonUp.

First we multiply a fraction by a whole number:

Now it's your turn:

D

Do:  2 X 33 : 3 = .......

​3​​2​​

x 33 = ...

solution:

2

another one for you:

3/13 x 52 = ....

1. 10
2. 9
3. 14
4. 12

Solution:

Now let's talk business:

Finally it's

Fraction times Fraction ...

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!

your turn again:

3/8 x 3/8 = ...

1. 9/8
2. 9/64
3. 6/16
4. 3/64

Solution:

Fotovraag: work out on paper, take a pic and send in in next slide!

1st Show your CALCULATION!

2nd This a task for ALL!

Don't forget to SIMPLIFY your answer, in the end!

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

Solution:

Now it's time for a complicated one:

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

This is the Solution:

For example this one.                                   You might think:

2  x  3 = 6      and                 x          = 

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

​2​​1​​

​4​​1​​

​8​​1​​

​8​​1​​

​8​​1​​

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

again work out on paper and send it in.

This time for every-every-every one!

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

Solution:

Homework:

§8.5 Make 8.5.

Write down your CALCULATIONS.

Showing only the answers has no value.

It's about the process of WORKING them out in LITTLE STEPS!