Keystones — Capstone
Five GCSE retrieval questions · 11 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 5x + 8
Answer: (x + 5⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 14cm, angle = 76°. Give your answer to 2 decimal places
Answer: 149.43cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 43, 81, 53, 81, 18, 43. Give your answer to 2 decimal places
Answer: Mean = 59.57, Median = 53, Range = 80