Keystones — Capstone
Five GCSE retrieval questions · 3 August 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √605
Answer: 11√5 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 27cm, angle = 59°. Give your answer to 2 decimal places
Answer: 347.15cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 25:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 75, 77, 26, 92, 57, 98, 43, 15. Give your answer to 2 decimal places
Answer: Mean = 57.33, Median = 57, Range = 83