Keystones — Capstone
Five GCSE retrieval questions · 13 February 2013 · 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 + 20x - 10
Answer: 2(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 15cm, angle = 78°. Give your answer to 2 decimal places
Answer: 168.73cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 12:14:7 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 57, 86, 87, 26, 89, 62. Give your answer to 2 decimal places
Answer: Mean = 60.43, Median = 62, Range = 73