Keystones — Capstone
Five GCSE retrieval questions · 11 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: x² - 9x + 4
Answer: (x - 9⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 66°. Give your answer to 2 decimal places
Answer: 109.63cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 86, 71, 60, 97, 52, 21, 44, 18. Give your answer to 2 decimal places
Answer: Mean = 56.11, Median = 56, Range = 79