Keystones — Capstone
Five GCSE retrieval questions · 20 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 13
Answer: 4(x + 6)² - 131 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 71°. Give your answer to 2 decimal places
Answer: 173.98cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 8:40:5 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 43, 83, 39, 53, 39, 36, 66
Answer: Mean = 56.5, Median = 48, Range = 57