Keystones — Capstone
Five GCSE retrieval questions · 27 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 4
Answer: (x - 3⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 12cm, angle = 46°. Give your answer to 2 decimal places
Answer: 103.58cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 35:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 88, 11, 24, 63, 62, 53, 34, 61
Answer: Mean = 49.5, Median = 57, Range = 77