Keystones — Capstone
Five GCSE retrieval questions · 5 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² - x + 11
Answer: (x - 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 71°. Give your answer to 2 decimal places
Answer: 158.85cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:40:16 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 97, 71, 94, 42, 58, 66, 21, 99
Answer: Mean = 69, Median = 71, Range = 78