Keystones — Capstone
Five GCSE retrieval questions · 2 May 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² - x - 12
Answer: (x - 1⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 62°. Give your answer to 2 decimal places
Answer: 253.85cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 30:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 24, 87, 71, 92, 80, 12, 63. Give your answer to 2 decimal places
Answer: Mean = 61.38, Median = 67, Range = 80