Keystones — Capstone
Five GCSE retrieval questions · 24 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√125
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 20cm, angle = 62°. Give your answer to 2 decimal places
Answer: 220.74cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 8:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 40, 38, 64, 56, 71, 78, 71
Answer: Mean = 55.5, Median = 60, Range = 52