Keystones — Capstone
Five GCSE retrieval questions · 14 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 6
Answer: 4(x - 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 48°. Give your answer to 2 decimal places
Answer: 291.31cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 64, 99, 59, 38, 95, 78, 29
Answer: Mean = 63.75, Median = 61.5, Range = 70