Keystones — Capstone
Five GCSE retrieval questions · 5 March 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² + 3x - 8
Answer: (x + 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 16cm, angle = 65°. Give your answer to 2 decimal places
Answer: 94.26cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 45:72:32 -
5. Statistics Averages and range
Find the mean, median and range of: 52, 76, 59, 89, 65, 88, 36, 13
Answer: Mean = 59.75, Median = 62, Range = 76