Keystones — Capstone
Five GCSE retrieval questions · 3 May 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: x² - 7x - 5
Answer: (x - 7⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 12cm, angle = 60°. Give your answer to 2 decimal places
Answer: 119.51cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 15:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 15, 39, 79, 32, 72, 69, 35, 40. Give your answer to 2 decimal places
Answer: Mean = 46.56, Median = 39, Range = 64