Keystones — Capstone
Five GCSE retrieval questions · 10 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 79°. Give your answer to 2 decimal places
Answer: 267.98cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 24:56:49 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 50, 77, 50, 72, 79, 15, 29. Give your answer to 2 decimal places
Answer: Mean = 57.88, Median = 61, Range = 76