Keystones — Capstone
Five GCSE retrieval questions · 24 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² - 9x + 11
Answer: (x - 9⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 30cm, angle = 75°. Give your answer to 2 decimal places
Answer: 376.71cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 2:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 43, 65, 95, 14, 25, 60, 25, 95
Answer: Mean = 54, Median = 60, Range = 81