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Compound Units

PROCEDURAL
MathematicsRatio & Proportion|Ages 11—14|ID: mt_kLQOzZYrd5

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 [child] work out its average speed — and use the same idea to solve problems about price per kilogram or density of a material?”

Curriculum Standards3 alignments

6.RP.3bCommon Core State Standards for Mathematics
Solve Unit Rate Problems

Solve unit rate problems including those involving unit pricing and constant speed. For example, if it took 7 hours to mow 4 lawns, then at that rate, how many lawns could be mowed in 35 hours? At what rate were lawns being mowed?

RP
7.RP.1Common Core State Standards for Mathematics
Compute unit rates associated with ratios of fractions

Compute unit rates associated with ratios of fractions, including ratios of lengths, areas and other quantities measured in like or different units. For example, if a person walks 1/2 mile in each 1/4 hour, compute the unit rate as the complex fraction 1/2/1/4 miles per hour, equivalently 2 miles per hour.

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KS3.Maths.Ratio.10The national curriculum in England
Compound Units

use compound units such as speed, unit pricing and density to solve problems

Mathematics · Key Stage 3

Prerequisites5

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