1TTO §8.4 Adding and subtracting fractions

Fractions??!
Next slide shows you some of those little fellas!
Just lean back and let yourself be informed.

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Slide 1: Tekstslide
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In deze les zitten 24 slides, met interactieve quizzen en tekstslides.

Lesduur is: 30 min

Onderdelen in deze les

Fractions??!
Next slide shows you some of those little fellas!
Just lean back and let yourself be informed.

Slide 2 -Tekstslide

A fraction has a ......   and a ....... see below!
The number above is called:   the numerator ( = teller). It tells us: HOW MANY?
The number below is called:    the denominator (= noemer). It tells us the
TOTAL of the numbers and it's also the NAME.
4 = numerator     and
5 = denominator
54

Slide 3 -Tekstslide

Finally don't forget to SIMPLIFY the answer, if possible!

Slide 7 -Tekstslide

However ..... is it always just a piece of cake?

Slide 8 -Tekstslide

When is it a bit more work to add or subtract fractions?
What kinda fractions are at stake then?

Slide 9 -Woordweb

With 'common' denominators 'equal' ones are meant!

3/4 - 2/5 = ....

Slide 13 -Woordweb

explanation:
the new denominator becomes         4 x 5 = 20 now!

-                     =                           -                            =
43
52
2015
208
207

Slide 15 -Tekstslide

But .........
How to add or subtract fractions like:

3           and      6          ?

Next slide explains more.
65
43

Slide 17 -Tekstslide

The following slide ...
as it deals with tricky fraction facets!
Unequal denominators and more
trouble...

Slide 19 -Tekstslide

How to do it?! Think about common denominators, of course.
What is the final outcome?

5 2/3 + 7/11 =

Homework time