Keystones — Capstone
Five GCSE retrieval questions · 22 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 5x² - 50x + 8
Answer: 5(x - 5)² - 117 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 20cm, angle = 47°. Give your answer to 2 decimal places
Answer: 109.7cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 2:18:63 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 100, 31, 75, 14, 72, 30, 46
Answer: Mean = 55.75, Median = 59, Range = 86