Keystones — Capstone
Five GCSE retrieval questions · 21 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² + 9x - 6
Answer: (x + 9⁄2)² - 105⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 63°. Give your answer to 2 decimal places
Answer: 174.64cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:63:81 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 26, 84, 40, 74, 81, 14. Give your answer to 2 decimal places
Answer: Mean = 57.86, Median = 74, Range = 72