Keystones — Capstone
Five GCSE retrieval questions · 12 August 2016 · 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 + 9x - 10
Answer: (x + 9⁄2)² - 121⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 41°. Give your answer to 2 decimal places
Answer: 157.45cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:21:9 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 86, 48, 85, 77, 19, 62. Give your answer to 2 decimal places
Answer: Mean = 56.14, Median = 62, Range = 70