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Proportion

CONCEPTUAL
MathematicsRatio & Proportion|Ages 12—14|ID: mt_5mIcmKRCgA

Recognise and solve problems involving direct proportion (as one quantity increases, the other increases at a constant rate) and inverse proportion (as one increases, the other decreases), including graphical and algebraic representations

Mastery Evidence

  • Identify whether a real-world relationship is direct or inverse proportion and justify the choice
  • Set up and solve a direct-proportion equation (e.g. if 4 pens cost £6, find the cost of 10)
  • Sketch graphs showing direct proportion (straight line through origin) and inverse proportion (curve)

Assessment Prompt

“Does [child] understand the difference between quantities that grow together at the same rate (direct proportion) and ones where one goes up as the other goes down — like more workers meaning fewer days to finish a job (inverse proportion)?”

Curriculum Standards3 alignments

7.RP.2Common Core State Standards for Mathematics
Recognize and represent proportional relationships

Recognize and represent proportional relationships between quantities.

RP
7.RP.2dCommon Core State Standards for Mathematics
Explain what a point (x, y) on the graph of a proportional relationship means

Explain what a point (x, y) on the graph of a proportional relationship means in terms of the situation, with special attention to the points (0, 0) and (1, r) where r is the unit rate.

RP
KS3.Maths.Ratio.9The national curriculum in England
Direct and Inverse Proportion

solve problems involving direct and inverse proportion, including graphical and algebraic representations

Mathematics · Key Stage 3

Prerequisites5

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Unlocks1