Keystones — Capstone
Five GCSE retrieval questions · 15 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √75
Answer: 5√3 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 10
Answer: 2(x + 2)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 58°. Give your answer to 2 decimal places
Answer: 126.78cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 56:63:36 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 45, 22, 41, 12, 75, 39, 44, 14. Give your answer to 2 decimal places
Answer: Mean = 36.78, Median = 39, Range = 63