Keystones — Capstone
Five GCSE retrieval questions · 14 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 9
Answer: 2(x + 5)² - 59 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 25cm, angle = 73°. Give your answer to 2 decimal places
Answer: 286.89cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 30:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 32, 86, 54, 60, 72, 59, 45
Answer: Mean = 53.75, Median = 56.5, Range = 64