Page 185 - SK Year 5 Mathematics DLP

5 5 LENGTH, MASS, AND
ASS, AND
LENGTH, M
VOLUME OF LIQUID
VOLUME OF LIQ UID

CONVERT UNITS OF LENGTH

Millimetres and centimetres This weighing tool was invented

1
1 using 9.2 cm thread and a 36 cm
2
clothes hanger.

a Convert 9.2 cm to mm.

9.2 cm = mm
9.2 cm = (9.2 × 10) mm

= 92 mm
9.2 cm = 92 mm
1
b Convert 36 cm to mm.
2
1 1 cm = 10 mm
36 cm = mm
2 × 10
1 73 5
36 cm = ( × 10) mm 1
2 2 cm mm
1 7 3
= 365 mm × 5 ÷ 10
1 3 6 5
36 cm = 365 mm
2

2 47 mm = cm 3 20 cm 6 mm = cm

47 mm = (47 ÷ 10) cm 6 ÷ 2
in decimal 20 cm 6 mm = 20 cm + ( 10 ÷ 2 ) cm
= 4.7 cm
3
5
in 47 mm = 47 cm = 20 cm + cm
fraction 10 3
7 = 20 cm
5
= 4 cm
10 3
20 cm 6 mm = 20 cm
7 5
47 mm = 4.7 cm or 4 cm
10
• Carry out simulation activities for measuring length, thickness of objects,
5.1.1 (i) and depths of water in cm and mm. Then, ask pupils to convert the unit 177
5.1.2 (i) to decimals or fractions.
• Recall methods of quick multiplication and division involving any
numbers by 10.