Keystones — Capstone
Five GCSE retrieval questions · 29 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√24
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: x² - 5x - 1
Answer: (x - 5⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 60°. Give your answer to 2 decimal places
Answer: 145.49cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 5:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 38, 34, 17, 42, 31, 53, 19. Give your answer to 2 decimal places
Answer: Mean = 40.63, Median = 36, Range = 74