Mathematics
Ratio & Proportion
Procedural
11–14 yrs
Compound Units
复合单位
Description
Use compound units such as speed (distance ÷ time), unit pricing (cost ÷ quantity), and density (mass ÷ volume); solve problems involving compound units
Mastery Evidence
- Calculate average speed given distance and time, converting between km/h and m/s if needed
- Compare unit prices of two products sold in different quantities to find the better deal
- Use the density formula to find mass, volume, or density given the other two values
Assessment Prompt
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?
