Keystones — Capstone
Five GCSE retrieval questions · 19 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² - 3x - 3
Answer: (x - 3⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 23cm, angle = 72°. Give your answer to 2 decimal places
Answer: 207.81cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 40, 100, 64, 52, 83, 91
Answer: Mean = 63, Median = 64, Range = 89