Keystones — Capstone
Five GCSE retrieval questions · 13 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √108
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: x² - 11x + 6
Answer: (x - 11⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 17cm, angle = 72°. Give your answer to 2 decimal places
Answer: 226.35cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 4:14:63 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 53, 10, 49, 69, 56, 94, 79, 52. Give your answer to 2 decimal places
Answer: Mean = 61.67, Median = 56, Range = 84