Keystones — Capstone
Five GCSE retrieval questions · 13 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 10
Answer: (x - 7⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 23cm, angle = 59°. Give your answer to 2 decimal places
Answer: 236.58cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 99, 70, 42, 30, 90, 78, 42. Give your answer to 2 decimal places
Answer: Mean = 59.38, Median = 56, Range = 75