Keystones — Capstone
Five GCSE retrieval questions · 7 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 4x² + 8x + 14
Answer: 4(x + 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 27cm, angle = 62°. Give your answer to 2 decimal places
Answer: 202.64cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 50, 100, 51, 75, 20, 71, 72
Answer: Mean = 60.5, Median = 61, Range = 80