Exam preparation
ACT
- Multiple choice
- Essay
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3 guides for this exam — how to prepare, what to practise, and how to know it has gone in.
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A written answer, marked
A question from an ACT mock paper, answered and marked. From ACT Practice Questions: Timed Mixed Section Set.
A science table shows that Sample X produced 42 units at 20°C and 56 units at 30°C. What was the percentage increase?
3/4The increase was 14 units, so the percentage increase was 14/56 × 100 = 25%.
The subtraction is correct, but the percentage increase must use the original value, 42, as the denominator.
Missed
−Use (new − original) ÷ original.
−14 ÷ 42 × 100 = 33.3%, approximately.
Model answerThe increase is 56 − 42 = 14 units. Percentage increase is 14 ÷ 42 × 100, which is approximately 33.3%. The original measurement is the denominator because the question asks how much the value increased from its starting point.
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Guides
- ACT Preparation: A Practical Guide for Test DayA practical ACT preparation guide covering English, Math, Reading and Science, with timed practice, error review and strategic skipping.
- ACT Study Plan: A Practical Week-by-Week MethodBuild a practical ACT study plan for English, Math, Reading, Science and optional Writing, with timed practice and targeted review.
- ACT Practice Questions: Timed Mixed Section SetWork through 10 ACT practice questions in English, Math, Reading and Science, with explanations, timing advice and a targeted review method.
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