Units of Measurement
Measurement in Year 7 involves choosing appropriate units, converting between units within the metric system, and solving problems involving perimeter, area, and volume.
What You Need to Know
Key Concept Diagram
The metric system is based on powers of 10: kilo (x1000), centi (x1/100), milli (x1/1000)
Length: 1 km = 1000 m; 1 m = 100 cm; 1 cm = 10 mm
Area: 1 m^2 = 10 000 cm^2; 1 km^2 = 1 000 000 m^2
Volume: 1 L = 1000 mL; 1 m^3 = 1000 L
Key Vocabulary
Metric system
A decimal-based system of measurement used worldwide
Conversion
Changing from one unit to another without changing the actual quantity
Prefix
A word part attached to a unit name to indicate a power of 10, e.g. kilo-, centi-, milli-
Perimeter
The total distance around the outside of a shape
Knowledge Check
Select the correct answer for each question. Click "Check Answer" to see if you are right.
Question 1
Convert 3.5 km to metres.
Question 2
A rectangle is 4 m long and 2.5 m wide. What is its area?
Question 3
How many millilitres are in 2.75 litres?
Key Concepts Summary
- ●The metric system is based on powers of 10: kilo (x1000), centi (x1/100), milli (x1/1000)
- ●Length: 1 km = 1000 m; 1 m = 100 cm; 1 cm = 10 mm
- ●Area: 1 m^2 = 10 000 cm^2; 1 km^2 = 1 000 000 m^2
- ●Volume: 1 L = 1000 mL; 1 m^3 = 1000 L