Keystones — Capstone
Five GCSE retrieval questions · 4 January 2018 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 50°. Give your answer to 2 decimal places
Answer: 126.4cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 81:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 57, 62, 13, 66, 79, 93, 51, 66. Give your answer to 2 decimal places
Answer: Mean = 62.78, Median = 66, Range = 80