Keystones — Capstone
Five GCSE retrieval questions · 29 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: x² + 9x - 9
Answer: (x + 9⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 24cm, angle = 74°. Give your answer to 2 decimal places
Answer: 173.03cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 72, 64, 96, 68, 71, 17. Give your answer to 2 decimal places
Answer: Mean = 67.29, Median = 71, Range = 79