Keystones — Capstone
Five GCSE retrieval questions · 28 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: x² - x - 6
Answer: (x - 1⁄2)² - 25⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 16cm, angle = 64°. Give your answer to 2 decimal places
Answer: 93.47cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 35:21:27 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 96, 29, 38, 95, 93, 89
Answer: Mean = 72, Median = 89, Range = 67