Keystones — Capstone
Five GCSE retrieval questions · 29 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√32
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: x² - x - 9
Answer: (x - 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 23cm, angle = 58°. Give your answer to 2 decimal places
Answer: 146.29cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 3:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 81, 51, 93, 78, 31, 86. Give your answer to 2 decimal places
Answer: Mean = 66.57, Median = 78, Range = 62