1718 WB1Y CH10 Lesson 4

Which exercises/theory should I discuss on the board?
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Slide 1: Mind map
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This lesson contains 11 slides, with interactive quizzes and text slides.

time-iconLesson duration is: 50 min

Items in this lesson

Which exercises/theory should I discuss on the board?

Slide 1 - Mind map

Using the calculator
Your calculator follows the order of operations
(calculation order):
1. Brackets
2. Powers
3. Multiply and Divide from left to right
4. Add and Subtract from left to right

Slide 2 - Slide

To type a fraction you can use the division

Slide 3 - Slide

Calculations with fractions
When doing calculations with fractions on your
calculator, remember the order of operations.
Use brackets if needed.

Slide 4 - Slide



Slide 5 - Open question

Fractions <--> Decimal numbers
You can use this button to switch your display
between fractions and decimal numbers.

Slide 6 - Slide

Rounding off decimal numbers
Some fractions have an infinite number of decimals.
If you type in                                   your screen will give:

There should be more numbers after the decimal point, but there is not enough room on your calculator to show them all.

Slide 7 - Slide

Rounding off decimal numbers
The decimal number can be rounded off.
When rounding off to 1 decimal place, look at the 2nd decimal, if the 2nd decimal is a 0/1/2/3/4, leave the 1st decimal as it is. if the 2nd decimal is a 5/6/7/8/9, increase the 1st decimal by 1. (When rounding to 2 decimal places, look at the 3rd decimal, etc)
To one decimal place: 2.4               (because the 2nd decimal is a 2)
To two decimal places: 2.43          (because the 3rd decimal is an 8)
To three decimal places: 2.429     (because the 4th decimal is a 5)

Slide 8 - Slide

What is 2.4285714286 rounded off
to 4 decimal places?

Slide 9 - Open question

Approximately sign
When rounding off a decimal number you use the           -sign.
This sign means "is approximately equal to".

If a number is not rounded off, you use the        -sign.
This sign means "is (exactly) equal to".

Slide 10 - Slide

Homework Tuesday
Make and correct from §10.4: 19 - 28

Make and correct any exercises from Refresh, §10.2 and §10.3 you have not done yet (see studyplanner).

Slide 11 - Slide