Keystones — Capstone
Five GCSE retrieval questions · 8 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 3x - 5
Answer: (x + 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 197.99cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 26, 38, 93, 27, 58, 16. Give your answer to 2 decimal places
Answer: Mean = 46.14, Median = 38, Range = 77