Keystones — Capstone
Five GCSE retrieval questions · 5 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + x + 4
Answer: (x + 1⁄2)² + 15⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 68°. Give your answer to 2 decimal places
Answer: 90.4cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 85, 45, 22, 83, 32, 83, 45, 66. Give your answer to 2 decimal places
Answer: Mean = 59.44, Median = 66, Range = 63