Keystones — Capstone
Five GCSE retrieval questions · 23 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√250
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: x² + 7x - 4
Answer: (x + 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 25cm, angle = 77°. Give your answer to 2 decimal places
Answer: 328.85cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 81:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 16, 20, 90, 92, 17, 27. Give your answer to 2 decimal places
Answer: Mean = 41.86, Median = 27, Range = 76