Keystones — Capstone
Five GCSE retrieval questions · 27 March 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√28
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 63°. Give your answer to 2 decimal places
Answer: 178.2cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:36:32 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 35, 44, 76, 21, 10, 23, 43, 94. Give your answer to 2 decimal places
Answer: Mean = 47.44, Median = 43, Range = 84