Keystones — Capstone
Five GCSE retrieval questions · 13 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
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 = 28cm, b = 18cm, angle = 41°. Give your answer to 2 decimal places
Answer: 165.33cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 10:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 88, 44, 73, 54, 96, 57, 38
Answer: Mean = 59.25, Median = 55.5, Range = 72