Keystones — Capstone
Five GCSE retrieval questions · 6 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√160
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 2x² + 12x + 12
Answer: 2(x + 3)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 19cm, angle = 67°. Give your answer to 2 decimal places
Answer: 139.92cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 3:15:10 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 41, 40, 88, 63, 27, 34, 67, 84
Answer: Mean = 52, Median = 41, Range = 64