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1TTO §8.4 Adding and subtracting fractions
§8.4 Adding and subtracting fractions.
Fractions??!
Forgotten all about them?
Next slide shows you some of those little fellas!
Just lean back and let yourself be informed.
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Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
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24 slides
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Lesson duration is:
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§8.4 Adding and subtracting fractions.
Fractions??!
Forgotten all about them?
Next slide shows you some of those little fellas!
Just lean back and let yourself be informed.
Slide 1 - Slide
Slide 2 - Slide
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
5
4
Slide 3 - Slide
Finally don't forget to SIMPLIFY the answer, if possible!
Slide 4 - Slide
Slide 5 - Slide
Slide 6 - Slide
Slide 7 - Slide
However ..... is it always just a piece of cake?
Slide 8 - Slide
When is it a bit more work to add or subtract fractions?
What kinda fractions are at stake then?
Slide 9 - Mind map
With 'common' denominators 'equal' ones are meant!
Slide 10 - Slide
Slide 11 - Slide
Slide 12 - Slide
3/4 - 2/5 = ....
Slide 13 - Mind map
explanation:
the new denominator becomes 4 x 5 = 20 now!
- = - =
4
3
5
2
2
0
1
5
2
0
8
2
0
7
Slide 14 - Slide
Slide 15 - Slide
But .........
How to add or subtract fractions like:
3 and 6 ?
Next slide explains more.
6
5
4
3
Slide 16 - Slide
Slide 17 - Slide
The following slide ...
Asks for your complete attention,
as it deals with tricky fraction facets!
Unequal denominators and more
trouble...
Slide 18 - Slide
Slide 19 - Slide
Just think hard about this one!
How to do it?! Think about common denominators, of course.
What is the final outcome?
Maybe you'll get the turn to share your answer!
Slide 20 - Slide
Slide 21 - Slide
5 2/3 + 7/11 =
Slide 22 - Mind map
Homework time
Slide 23 - Slide
Slide 24 - Slide
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