Keystones — Capstone
Five GCSE retrieval questions · 10 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: x² + 3x + 8
Answer: (x + 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 59°. Give your answer to 2 decimal places
Answer: 225.01cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 45:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 73, 36, 44, 98, 30, 81. Give your answer to 2 decimal places
Answer: Mean = 54.86, Median = 44, Range = 76