Keystones — Capstone
Five GCSE retrieval questions · 30 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² + x + 2
Answer: (x + 1⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 25cm, angle = 63°. Give your answer to 2 decimal places
Answer: 133.65cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 18:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 91, 55, 18, 71, 71, 35, 42. Give your answer to 2 decimal places
Answer: Mean = 49.13, Median = 48.5, Range = 81