Keystones — Capstone
Five GCSE retrieval questions · 17 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: x² + x - 3
Answer: (x + 1⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 55°. Give your answer to 2 decimal places
Answer: 296.94cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 86, 29, 81, 44, 40, 58, 79. Give your answer to 2 decimal places
Answer: Mean = 59.57, Median = 58, Range = 57