Keystones — Capstone
Five GCSE retrieval questions · 8 February 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 7
Answer: 2(x - 2)² - 1 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 52°. Give your answer to 2 decimal places
Answer: 140.66cm² -
4. Ratio Combining two ratios
a:b is 5:8 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 35:56:64 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 59, 25, 99, 26, 40, 11, 13, 84. Give your answer to 2 decimal places
Answer: Mean = 44.67, Median = 40, Range = 88