Keystones — Capstone
Five GCSE retrieval questions · 23 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 7x - 8
Answer: (x - 7⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 28cm, angle = 63°. Give your answer to 2 decimal places
Answer: 324.33cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 15:40:72 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 20, 40, 10, 87, 82, 48
Answer: Mean = 54, Median = 48, Range = 81