Keystones — Capstone
Five GCSE retrieval questions · 31 March 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 13
Answer: 3(x - 5)² - 62 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 25cm, angle = 75°. Give your answer to 2 decimal places
Answer: 350.15cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 3:12:28 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 24, 52, 85, 82, 61, 42, 58. Give your answer to 2 decimal places
Answer: Mean = 56.38, Median = 55, Range = 61