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1TH/Vwo §8.5 multiplying fractions
§8.5 Multiplying fractions
After + and - we now look at
the operation: x !
By the way, this is a pretty long LessonUp.
The Homework however is only 3 exercises.
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Tekstslide
Wiskunde
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havo, vwo
Leerjaar 1
In deze les zitten
34 slides
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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.
The Homework however is only 3 exercises.
Slide 1 - Tekstslide
First we multiply a fraction by a whole number:
Slide 2 - Tekstslide
Slide 3 - Tekstslide
Now it's your turn:
Slide 4 - Tekstslide
3
2
timer
1:00
x 33 = ...
Slide 5 - Woordweb
solution:
Slide 6 - Tekstslide
another one for you:
Slide 7 - Tekstslide
3/13 x 52 = ....
timer
0:25
A
10
B
9
C
14
D
12
Slide 8 - Quizvraag
Solution:
Slide 9 - Tekstslide
Slide 10 - Tekstslide
Now let's talk business:
Finally it's
Fraction times Fraction ...
Slide 11 - Tekstslide
Slide 12 - Tekstslide
2 Important points:
. and .
Slide 13 - Tekstslide
an even more important point is this:
COMMON MISUNDERSTANDING; somebody tries to tackle the task below :
' Wait a sec, the new denominator is 14 x 4, but then it's still a long way....
x = x = x ??? I am at a loss...'
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Slide 14 - Tekstslide
Why does this method really suck?
Slide 15 - Woordweb
SOLUTION:
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!
Slide 16 - Tekstslide
Slide 17 - Tekstslide
Slide 18 - Tekstslide
Slide 19 - Tekstslide
Slide 20 - Tekstslide
your turn again:
Slide 21 - Tekstslide
3/8 x 3/8 = ...
timer
0:25
A
9/8
B
9/64
C
6/16
D
3/64
Slide 22 - Quizvraag
Solution:
Slide 23 - Tekstslide
Fotovraag: first work it out in your Notebook, take a pic and send in in next slide!
Show your CALCULATION!
Don't forget to SIMPLIFY your answer, in the end!
Slide 24 - Tekstslide
2/7 + 1/7 x 1/2 = ......
timer
1:00
Slide 25 - Open vraag
Solution:
Slide 26 - Tekstslide
Now it's time for a complicated one:
Think about HOW to WORK it out!
After that we look at the solution.
Slide 27 - Tekstslide
This is the Solution:
Slide 28 - Tekstslide
For example this one. You might think:
2 x 3 = 6 and x =
So the final answer is: 6 + = 6 However this is WRONG!
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Slide 29 - Tekstslide
Let's look back at the previous slide for a sec to see if both methods are good!
Slide 30 - Tekstslide
Fotovraag:
again work it out in your Notebook first and then send it in.
Slide 31 - Tekstslide
1 1/8 x 1 1/3 = ......
timer
1:30
Slide 32 - Open vraag
Solution:
Slide 33 - Tekstslide
Homework:
§8.5 Make only these tasks:
40, 42, 44 and 45. (you've done so much already!)
Send in your CALCULATIONS.
NOTE: Showing only the answers has no value.
It's about WRITING DOWN the process in LITTLE STEPS!
Slide 34 - Tekstslide
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