Keystones — Capstone
Five GCSE retrieval questions · 23 March 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√99
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 3x² + 36x - 2
Answer: 3(x + 6)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 20cm, angle = 67°. Give your answer to 2 decimal places
Answer: 156.49cm² -
4. Ratio Combining two ratios
a:b is 1:6 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 7:42:54 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 11, 42, 28, 50, 50, 20, 19, 11. Give your answer to 2 decimal places
Answer: Mean = 34.33, Median = 28, Range = 67