Keystones — Capstone
Five GCSE retrieval questions · 9 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 2
Answer: 2(x + 4)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 69°. Give your answer to 2 decimal places
Answer: 161.04cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 77, 33, 85, 70, 23, 29, 86
Answer: Mean = 57, Median = 61.5, Range = 63