Keystones — Capstone
Five GCSE retrieval questions · 21 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 11x + 1
Answer: (x - 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 19cm, angle = 47°. Give your answer to 2 decimal places
Answer: 159.8cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 21:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 71, 40, 37, 10, 71, 15, 41, 56. Give your answer to 2 decimal places
Answer: Mean = 43.11, Median = 41, Range = 61