Keystones — Capstone
Five GCSE retrieval questions · 7 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √250
Answer: 5√10 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 8
Answer: 4(x + 4)² - 72 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 15cm, angle = 43°. Give your answer to 2 decimal places
Answer: 107.41cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 64, 36, 73, 32, 22, 48. Give your answer to 2 decimal places
Answer: Mean = 40.71, Median = 36, Range = 63