Keystones — Capstone
Five GCSE retrieval questions · 10 February 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: 4x² - 48x - 10
Answer: 4(x - 6)² - 154 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 26cm, angle = 66°. Give your answer to 2 decimal places
Answer: 320.65cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 35:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 95, 43, 61, 14, 79, 17, 32, 15. Give your answer to 2 decimal places
Answer: Mean = 49.78, Median = 43, Range = 81