Keystones — Capstone
Five GCSE retrieval questions · 26 May 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: x² - 11x + 1
Answer: (x - 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 30cm, angle = 72°. Give your answer to 2 decimal places
Answer: 299.58cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 8:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 91, 72, 81, 95, 38, 78. Give your answer to 2 decimal places
Answer: Mean = 66.57, Median = 78, Range = 84