Keystones — Capstone
Five GCSE retrieval questions · 31 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 4x² - 40x - 10
Answer: 4(x - 5)² - 110 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 12cm, angle = 72°. Give your answer to 2 decimal places
Answer: 85.6cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 16:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 75, 57, 19, 87, 52, 60, 73
Answer: Mean = 54.25, Median = 58.5, Range = 76