Keystones — Capstone
Five GCSE retrieval questions · 28 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 14
Answer: 4(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 49°. Give your answer to 2 decimal places
Answer: 90.57cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 88, 18, 90, 33, 10, 36, 86
Answer: Mean = 55.5, Median = 59.5, Range = 80