Keystones — Capstone
Five GCSE retrieval questions · 24 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 4
Answer: 3(x - 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 40°. Give your answer to 2 decimal places
Answer: 269.97cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 16, 20, 13, 45, 22, 86
Answer: Mean = 42, Median = 22, Range = 79