Keystones — Capstone
Five GCSE retrieval questions · 9 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√24
Answer: 6√6 -
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 = 23cm, b = 23cm, angle = 57°. Give your answer to 2 decimal places
Answer: 221.83cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 62, 64, 51, 44, 67, 48, 83, 42. Give your answer to 2 decimal places
Answer: Mean = 55.11, Median = 51, Range = 48