Keystones — Capstone
Five GCSE retrieval questions · 21 October 2013 · 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 - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 76°. Give your answer to 2 decimal places
Answer: 142.63cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 15:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 64, 82, 66, 19, 42, 58. Give your answer to 2 decimal places
Answer: Mean = 52.14, Median = 58, Range = 63