Page 53 - Cambridge Checkpoint Mathematics Coursebook 7_Slide 02

4.3 Reading scales

3 Estimate the readings on each of these scales.
50
a b c 50 50 60 60 60
50 50
cm cm 50 50 cm 50 60 60 60 m m 4 4 m 4 5 5 5 50 60
40
60
60
cmcmcm 505050 606060 mmm 444 555 40 40 km/h km/h
40km/h
40
40
km/hkm/hkm/h
d g g g e f °C °C °C
litres
300
300 300 g gg litres 2 litres 20 20 °C°C°C 20
litreslitreslitres 2
2
300300300 202020
222
200 200 200 1 1 1 10 10 10
200200200 111 101010
100 100 100 0 0 0 0 0 0
100100100 000 000
4 Mirai has two measuring jugs, A and B.
200 300

200
100
100

0 ml 0 ml
A B

She pours water into the measuring jugs to the levels shown.
How much water does she need to add to measuring jug A so
that there is the same amount of water in both jugs?

Summary

You should now know that: You should be able to:
★ The conversion factors for length are: ★ Use abbreviations for the metric units of length,
10 mm = 1 cm, 100 cm = 1 m, 1000 m = 1 km mass and capacity.
★ The conversion factors for mass are: ★ Convert between kilometres, metres, centimetres
and millimetres.
1000 g = 1 kg, 1000 kg = 1 t
★ Convert between tonnes, kilograms and grams.
★ The conversion factors for capacity are:
★ Convert between litres and millilitres.
1000 ml = 1 l
★ Choose suitable units of measurement to
★ When you are converting a smaller unit into a estimate, calculate and solve problems in
bigger one, you divide by the conversion factor. everyday contexts.
★ When you are converting a bigger unit into a ★ Read the scales on a range of measuring
smaller one, you multiply by the conversion factor. instruments.
★ When you order decimal numbers that involve ★ Understand everyday systems of measurement
measurements, you must make sure all the and use them to estimate, measure and calculate.
measurements are in the same units.
★ Work logically and draw simple conclusions.
★ When you read a scale you must start by working
out what each division on the scale represents.

4 Length, mass and capacity 4 Length, mass and capacity 51