Keystones — Capstone
Five GCSE retrieval questions · 5 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² + 5x - 7
Answer: (x + 5⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 59°. Give your answer to 2 decimal places
Answer: 225.01cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:20:8 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 10, 26, 48, 63, 21, 58, 73, 49
Answer: Mean = 43, Median = 48, Range = 63