Keystones — Capstone
Five GCSE retrieval questions · 18 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √243
Answer: 9√3 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 15
Answer: 4(x - 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 63°. Give your answer to 2 decimal places
Answer: 220.08cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 46, 54, 61, 92, 26, 71, 63
Answer: Mean = 62.5, Median = 62, Range = 66