Keystones — Capstone
Five GCSE retrieval questions · 8 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 9x - 1
Answer: (x - 9⁄2)² - 85⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 47°. Give your answer to 2 decimal places
Answer: 107.51cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 54, 97, 35, 100, 53, 74. Give your answer to 2 decimal places
Answer: Mean = 71.29, Median = 74, Range = 65