Keystones — Capstone
Five GCSE retrieval questions · 16 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 15
Answer: 4(x + 6)² - 159 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 12cm, angle = 77°. Give your answer to 2 decimal places
Answer: 146.16cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 56:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 27, 41, 76, 85, 21, 98, 33
Answer: Mean = 58.5, Median = 58.5, Range = 77