Keystones — Capstone
Five GCSE retrieval questions · 31 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: x² - 5x - 11
Answer: (x - 5⁄2)² - 69⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 15cm, angle = 64°. Give your answer to 2 decimal places
Answer: 107.86cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 25, 74, 25, 71, 50, 90, 98, 66. Give your answer to 2 decimal places
Answer: Mean = 62.38, Median = 68.5, Range = 73