Keystones — Capstone
Five GCSE retrieval questions · 16 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 6
Answer: 2(x - 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 13cm, angle = 74°. Give your answer to 2 decimal places
Answer: 112.47cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 15:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 28, 28, 50, 56, 62, 80, 19. Give your answer to 2 decimal places
Answer: Mean = 44.63, Median = 42, Range = 61