section 1.1: conversions grade 12 caps
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*Topic 1: MeasurementThe following sections will be covered:
1.1 Conversions
1.2 Time: working with transport time-tables
1.3 BMI growth charts for children
1.4 Calculating perimeter, area and volume
*ConversionsIn Section 1.1, learners will be able to:
*Convert units of measurement:
� from memory for the metric system,
�using given conversion factors and/tables,
� between different systems.
*Express measurement values and quantities in units appropriate to
the context.
*Conversions*We will start with revision of conversions done in Grade 10 and 11.
�Conversion from memory in the metric system
Table: 1Distance Mass Volume
10 mm = 1 cm 1 000 mg = 1 g
100 cm = 1 m 1 000 g = 1 kg
1 000 m = 1 km 1 000 kg = 1 tonne
*Conversions
�Conversions using conversion factors or tables:
Table: 2
�Conversions between different systems
Table: 3Baking powder Flour Salt Sugar
*Conversions
�Metric to imperial
Table: 4Imperial Metric Metric Imperial
Length 1 inch 25,4 mm1 cm 0,394 inch
1 foot (12 inches) 304,8 mm
1 mile 1,609 km 1 km 0,621 mile
Mass 1 ounce 28,35 g 1 g 0,035 ounces
1 pound (16 ounces) 453,59 g 1 kg 2,205 pounds
Volume 1 US gallon (8 pints) 3,785 l 1 l 0,624 US gallons
*Conversions�Calculated area to liquid volume conversions
How does a painter know how much paint to buy to paint a wall?
*First, he calculates the surface area that he will paint.
*Then he finds the spread rate of the paint he will use.
What is spread rate?
�It is the conversion ratio for converting from area to liquid volume.
*Question 3 What unit of measurement would you use to measure the capacity of a
cup?
A. Metres
B. Millilitres
C. millimitres
D. grams
*Question 7 Write 1 782 minutes in days, hours and minutes
A. 2 day 5 hours 42 minutes
B. 1 day 5 hours 42 minutes
C. 1 day 6 hours 42 minutes
D. 1 day 4 hours 42 minutes
*Question 8Jerry needs 4 tonnes of stone to mix with cement to lay a foundation of
a house. The stone can only be bought in bags of 25 kg. Calculate how
many bags he needs to order.
A. 320 bags
B. 32 bags
C. 16 bags
D. 160 bags