Keystones — Capstone
Five GCSE retrieval questions · 19 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 13
Answer: 4(x - 4)² - 77 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 80°. Give your answer to 2 decimal places
Answer: 175.79cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 6:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 24, 23, 11, 22, 77, 48, 36, 19
Answer: Mean = 31, Median = 23, Range = 66