Keystones — Capstone
Five GCSE retrieval questions · 13 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² - 5x + 7
Answer: (x - 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 23cm, angle = 68°. Give your answer to 2 decimal places
Answer: 266.57cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 20:36:63 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 52, 88, 33, 40, 16, 51, 51, 19. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 51, Range = 72