Units Of Measurement And Applications Worksheet Page 43
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446 Convert the following, giving the answer to 2 decimal places where necessary.
a 60 km/h to m/s
b 50 g/m
2
to kg/ha
7 Write sensible approximations for the results of the following calculations.
a 43.2 kg − 8 kg
b 125 g ÷ 85 mL
8 An amount of $15 000 is divided between two people in the ratio 5 : 3. What is the value of the smaller share?
9 The weight of meat decreases when it is cooked.
If the ratio of the weight of raw meat to cooked
meat is 1.25 : 1, calculate the weight of a 400 g
piece of meat after it has been cooked.
10
Sean went on a diet and in the fi rst week he lost
1.5 kg. This represented a 2% decrease in his
weight. Calculate his weight at the start of the diet.
2D
REVIEW SET
1 The number of children vaccinated at a clinic doubled from one year to the next. Comment on the statement:
There was a 200% increase in the number of children vaccinated.
2 Round 2.0695 to:
a 1 signifi cant fi gure
b 2 signifi cant fi gures
c 3 signifi cant fi gures
d 4 signifi cant fi gures.
3 Convert the following.
a 13.65 m to cm
b 3460 kg to t
c 276 s to min and s
4 Convert the following.
a 13.65 ha to m
2
b 1960 mm
2
2
to cm
c 3 700 000 cm
3
3
d 6.8 cm
3
3
to m
to mm
5 Convert the following.
a 6 mL to μL
b 4.2 Gg to kg
c 8.1 μs to ns
6 Calculate the following, expressing the answer in scientifi c notation.
__________
a (1.08 × 10
) ÷ (7.2 × 10
b √
1.96 × 10
−6
−5
20
)
7 The base and perpendicular height of a triangle were measured to be 15.4 cm and 12.5 cm.
a Find the area of the triangle using these measurements.
b Calculate the range within which the true area lies.
c What is the greatest possible error in using part a as the area?
d Express the greatest possible error as a percentage of the area.
Chapter 2
Units of measurement and applications
77
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