Keystones — Capstone
Five GCSE retrieval questions · 27 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: x² - x + 7
Answer: (x - 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 13cm, angle = 41°. Give your answer to 2 decimal places
Answer: 93.82cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 24:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 27, 15, 66, 95, 40, 83, 40, 35. Give your answer to 2 decimal places
Answer: Mean = 50.13, Median = 40, Range = 80