Compound Units
Use compound units such as speed (distance ÷ time), unit pricing (cost ÷ quantity), and density (mass ÷ volume); solve problems involving compound units
Typical age: 11–14 years
“If a car travels 150 miles in 2.5 hours, can your child work out its average speed — and use the same idea to solve problems about price per kilogram or density of a material?”
0 / 3 mastered
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Needs first
- Simple formulae
Rearranging compound unit formulae (speed = distance/time) uses formula rearrangement skills
- ProportionREQUIRED
Speed, density, and unit pricing are applications of direct/inverse proportion
- Proportional Reasoning VocabularyREQUIRED
Compound units (speed, density) require 'compound unit', 'rate', 'speed', and 'density' as named and defined vocabulary
- Proportion Graphs
Compound units like speed and density involve proportional relationships visible on proportion graphs
- Unit ConversionsREQUIRED
Compound units require confident unit conversion (e.g. km/h to m/s)