Keystones — Capstone
Five GCSE retrieval questions · 25 September 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: x² + 5x
Answer: (x + 5⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 12cm, angle = 78°. Give your answer to 2 decimal places
Answer: 76.3cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:28:4 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 65, 32, 56, 86, 55, 69
Answer: Mean = 59, Median = 56, Range = 54