Keystones — Capstone
Five GCSE retrieval questions · 28 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√20
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 2
Answer: (x - 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 27cm, angle = 64°. Give your answer to 2 decimal places
Answer: 242.67cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 15:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 12, 45, 28, 40, 10, 94, 91
Answer: Mean = 43.75, Median = 35, Range = 84