Keystones — Capstone
Five GCSE retrieval questions · 12 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √240
Answer: 4√15 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 15
Answer: 4(x + 1)² - 19 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 69°. Give your answer to 2 decimal places
Answer: 134.44cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:45:9 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 19, 43, 11, 74, 20, 45, 11
Answer: Mean = 40, Median = 31.5, Range = 86