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1Tvwo §9.5 Using cards PART 2
§ 9.5 Using cards PART 2
As the Method of SOLVING EQUATIONS is that important,
we do this paragraph in two lessons!
This should make it quite possible for you to work it all out
as the METHOD on p.111 shows you!
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Wiskunde
Middelbare school
havo, vwo
Leerjaar 1
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21 slides
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interactive quizzes
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Lesson duration is:
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§ 9.5 Using cards PART 2
As the Method of SOLVING EQUATIONS is that important,
we do this paragraph in two lessons!
This should make it quite possible for you to work it all out
as the METHOD on p.111 shows you!
Slide 1 - Slide
RECAP:
refreshing your memory!
an EQUATION is something like: 23 = 7t + 9
the SOLUTION to this is: t = 2, because 23 = 7 x 2 + 9 , or
23 = 14 + 9
this checks out!
Slide 2 - Slide
In the previous paragraph you have seen what an equation looks like and how to find a solution.
In this paragraph we will use a method called "using cards" to solve our equation.
You put a card over the term with the variable and decide what number should be written on the card.
Then you know that the term with the variable is equal to that number.
Slide 3 - Slide
Slide 4 - Slide
Slide 5 - Slide
Slide 6 - Slide
Slide 7 - Slide
This was a recap from last lesson (1st part of §9.5)
Now the 2nd part comes up:
on p.112 you find tasks that ask from you to:
- make a formula for a story
- fill in a number in that formula and finally
- solve the equation that results from all this
Slide 8 - Slide
Task 1 follows soon ...
But first a JOKE!
By the way, the book in the next slide is called:
'How to become a millionaire.'
Slide 9 - Slide
Slide 10 - Slide
Task 36 we'll do together right now.
Let's make it in your Notebook, now!
+ Let's first read it together.
+ TASK 1: Make a FORMULA for Kirsten's hair length in cm (= l) and the months
she is growing it (= m). THINK ABOUT THE GENERAL SHAPE OF A FORMULA!
+ One important detail: 12.5 mm = 1.25 cm !
Use cm only -not mm- in your Formula.
timer
1:00
Slide 11 - Slide
Length Kirsten's hair in a FORMULA
(the numbers 10, 1.25
and the words/letters: length and months
have to be in it!):
Slide 12 - Mind map
Now we have our formula:
length = 10 + 1.25 x months
It's handier to use a shortened version:
l = 10 + 1.25m
Slide 13 - Slide
Solution Task 1:
Slide 14 - Slide
TASK 2: Now we are gone make the equation. Fill in 35 for the length
Here's the FORMULA once more:
l = 10 + 1.25m
timer
1:00
Slide 15 - Slide
The equation will be (by filling in 35 for the length)
Slide 16 - Mind map
Task 3: Calculate how many months it takes her hair to be at least 35 cm long.
35 = 10 + 1.25m
timer
1:00
Slide 17 - Slide
Solve the equation: 35 = 10 + 1,25m
Slide 18 - Mind map
Solution Task 2:
Slide 19 - Slide
Homework
§9.5 Do exercises 35, 37, C9, C10
Check your answers with the solutionsbook in Teams.
Slide 20 - Slide
Solve the equation using cards
A
q
=
7
2
B
q
=
−
3
C
q
=
8
D
q
=
9
Slide 21 - Quiz
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