Keystones — Capstone
Five GCSE retrieval questions · 28 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √540
Answer: 6√15 -
2. Algebra Completing the square
Complete the square: 5x² - 40x + 11
Answer: 5(x - 4)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 57°. Give your answer to 2 decimal places
Answer: 293.53cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:30:12 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 74, 42, 21, 31, 66, 43. Give your answer to 2 decimal places
Answer: Mean = 47.86, Median = 43, Range = 53