Reading and Comparing Scales

1.

2. Scales

Where would you see a scale?
How many different places can you think of?
How many different types can you think of?

3. Did You Think of All These?

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speedometer
measuring jug
weighing scale
30cm ruler
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metre stick
thermometer
bathroom scale
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flood
measurement

4. Scales Can Be in a Straight Line

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5. …or Circular

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A circular scale is just like a number line that has been curved round.

6. Reading Scales

Find zero
Look at the numbers
Do the numbers go up in ones?
This one is straightforward because all the lines are numbered.
How much water is in the bucket?

7. Reading Scales

Find zero
Look at the numbers
Do the numbers go up in ones?
Are there any extra lines between
the numbers?
What do you think each extra line
represents?
Test your theory by counting up
the scale.

8. Reading Scales

5½
5
4½
4
3½
3
2½
2
1½
1
½
The scale goes up in ½ litres, we have tested it by counting up.
How much water is in the bucket?

9. Keep Using The Tips…

Find zero
Look at the numbers – what do they go up in?
Are there any extra lines between the numbers?
What do you think they represent?
Test your theory by counting between the numbers

10. What Do You Think?

Test your theory
Are
Look
What
there
at do
the
any
you
numbers
extra
think
lines
–
Find zero
by counting
between
what
between
they
do they
represent?
the numbers?
go up in?
the numbers.
65g
0g
90g
10g
80g
20g
70g
30g
60g
50g
40g

11. What About This One?

30
20
What is the
temperature today?
23°C
10
0

12. What Is the Same and What Is Different about These Scales?

10
20
9
18
8
16
7
14
6
12
5
10
4
8
3
6
2
4
1
2

13. What Is the Same and What Is Different about These Scales?

10
10
10
0
0
9
8
7
6
5
4
3
2
1
0

14. What Is the Same and What Is Different about These Scales?

0g
700
g
600
g
0g
100g
200
g
500
300
g 400 g
g
700
g
600
g
100g
200
g
500
300
g 400 g
g

15. What Is the Same and What Is Different about These Scales?