Keystones — Capstone
Five GCSE retrieval questions · 28 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² + x + 11
Answer: (x + 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 17cm, angle = 59°. Give your answer to 2 decimal places
Answer: 131.15cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 89, 40, 60, 76, 62, 48. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 60, Range = 49