Keystones — Capstone
Five GCSE retrieval questions · 18 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² + 5x + 9
Answer: (x + 5⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 45°. Give your answer to 2 decimal places
Answer: 256.33cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 32:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 62, 12, 99, 12, 68, 72, 45, 68. Give your answer to 2 decimal places
Answer: Mean = 55.67, Median = 63, Range = 87