Keystones — Capstone
Five GCSE retrieval questions · 26 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: x² + 5x + 2
Answer: (x + 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 20cm, angle = 74°. Give your answer to 2 decimal places
Answer: 115.35cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:56:16 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 13, 51, 35, 100, 100, 52, 30, 19. Give your answer to 2 decimal places
Answer: Mean = 49.56, Median = 46, Range = 87