Keystones — Capstone
Five GCSE retrieval questions · 27 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 14
Answer: 3(x - 2)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 27cm, angle = 58°. Give your answer to 2 decimal places
Answer: 240.42cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 64:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 22, 15, 68, 36, 51, 34, 44
Answer: Mean = 38, Median = 35, Range = 53