Keystones — Capstone
Five GCSE retrieval questions · 11 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: x² - 5x - 2
Answer: (x - 5⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 74°. Give your answer to 2 decimal places
Answer: 165.82cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 54:45:40 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 75, 84, 20, 16, 61, 49, 41, 18
Answer: Mean = 47, Median = 49, Range = 68