Keystones — Capstone
Five GCSE retrieval questions · 31 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√12
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 9
Answer: 2(x + 4)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 74°. Give your answer to 2 decimal places
Answer: 201.86cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 72:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 48, 50, 34, 29, 12, 48, 84
Answer: Mean = 49, Median = 48, Range = 75