Keystones — Capstone
Five GCSE retrieval questions · 19 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √80
Answer: 4√5 -
2. Algebra Completing the square
Complete the square: 2x² - 4x
Answer: 2(x - 1)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 45°. Give your answer to 2 decimal places
Answer: 89.cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 10:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 73, 89, 25, 91, 36, 30, 63, 81
Answer: Mean = 61, Median = 68, Range = 66