Keystones — Capstone
Five GCSE retrieval questions · 23 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√96
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: x² - x - 10
Answer: (x - 1⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 71°. Give your answer to 2 decimal places
Answer: 153.17cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 58, 44, 25, 84, 30, 43. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 43, Range = 62