Keystones — Capstone
Five GCSE retrieval questions · 23 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 5x² - 40x - 4
Answer: 5(x - 4)² - 84 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 27cm, angle = 76°. Give your answer to 2 decimal places
Answer: 366.77cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 10:12:3 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 54, 82, 81, 36, 98, 87, 93
Answer: Mean = 76.25, Median = 81.5, Range = 62