Keystones — Capstone
Five GCSE retrieval questions · 1 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 5x + 11
Answer: (x + 5⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 16cm, angle = 66°. Give your answer to 2 decimal places
Answer: 175.4cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 9:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 18, 82, 81, 38, 98, 87, 62, 18, 39. Give your answer to 2 decimal places
Answer: Mean = 58.11, Median = 62, Range = 80