Page 189 - SK Year 5 Mathematics DLP

ADDITION OF UNITS OF LENGTH
Uranus
18.4 cm
1 a Calculate the total length of the strings Earth
of the Earth and Uranus replicas. 26.3 cm

26.3 cm + 18.4 cm = cm
Mercury
1 1
26.3 cm 30 cm
2
+ 1 8.4 cm
44.7 cm
26.3 cm + 18.4 cm = 44.7 cm

The total length of the strings of the Earth and
Uranus replicas is 44.7 cm.

b Total up the length, in mm, of the strings of the Earth,
Uranus, and Mercury replicas.

1
26.3 cm + 18.4 cm + 30 cm = mm
2
1 1
1 1
30 cm = 30 cm + cm 2 6.3 cm
2 2 1 8.4 cm
= 30 cm + 0.5 cm + 3 0.5 cm 75.2 cm
= 30.5 cm 7 5.2 cm = (75.2 × 10) mm

1 = 752 mm
26.3 cm + 18.4 cm + 30 cm = 752 mm
2
The total length of the strings of the Earth, Uranus, and Mercury

replicas is 752 mm.

3
2 74 cm + 1.08 m + 2 m = m
4
2 .7 5m
74 cm = (74 ÷ 100) m 3 11
2 m = m 4 1 1.0 0m
= 0.74 m 4 4 − 8
= 2.75 m
3 0
3 −
74 cm + 1.08 m + 2 m 2 8
4
= 0.74 m + 1.08 m + 2.75 m 2 0
− 2 0
= 4.57 m 0
3
74 cm + 1.08 m + 2 m = 4.57 m
4
• Ask pupils to make sure that all the measurements have been
converted to the same unit and same form (fraction or decimal) 181
5.1.3 before performing addition.
• Carry out an activity of adding all the sides of various triangular
shapes involving measurements in fractions and decimals.