Keystones — Capstone
Five GCSE retrieval questions · 15 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 13
Answer: 2(x + 4)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 14cm, angle = 60°. Give your answer to 2 decimal places
Answer: 139.43cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 28:63:9 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 74, 32, 90, 62, 32, 42, 22
Answer: Mean = 54.25, Median = 52, Range = 68