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Grade 8 · Number · Interactive practice

Proportion Practice

Practise unit rates, equivalent ratios, and unknown values. Work through all three problems and use the feedback to improve your strategy.

All 3 questions

Eight notebooks cost $14. At the same rate, what do 20 notebooks cost?

Choose an answer, then check your thinking.

View every question and worked answer

  1. Eight notebooks cost $14. At the same rate, what do 20 notebooks cost?

    Answer: $35

    The unit rate is $14 ÷ 8 = $1.75. Then 20 × $1.75 = $35.

  2. Solve 5/8 = x/40.

    Answer: x = 25

    The denominator is scaled by 5, so the numerator is also scaled by 5: 5 × 5 = 25.

  3. Which equation represents a proportional relationship?

    Answer: y = 2.5x

    A proportional relationship has a constant rate and an initial value of zero.