Keystones — Capstone
Five GCSE retrieval questions · 9 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 10
Answer: 2(x - 4)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 15cm, angle = 75°. Give your answer to 2 decimal places
Answer: 188.36cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 14:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 52, 34, 31, 22, 17, 17. Give your answer to 2 decimal places
Answer: Mean = 28.57, Median = 27, Range = 35