Keystones — Capstone
Five GCSE retrieval questions · 14 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² + 7x + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 69°. Give your answer to 2 decimal places
Answer: 112.03cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 20:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 22, 17, 66, 90, 29, 44, 52, 45. Give your answer to 2 decimal places
Answer: Mean = 46.11, Median = 45, Range = 73