Proportion Graphs

Mastery Evidence

• Plot pairs of proportional values on a coordinate grid and draw the straight line through the origin
• Explain why a directly proportional relationship always passes through (0,0)
• Read a proportion graph to find an unknown value — e.g. 'If 3 kg costs £6, how much does 5 kg cost?'

Assessment Prompt

“If [child] is comparing the cost of buying different numbers of cinema tickets, can they sketch a proportion graph — a straight line through zero — and use it to read off the cost of any number of tickets without recalculating each time?”