Keystones — Capstone
Five GCSE retrieval questions · 12 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 10
Answer: (x + 11⁄2)² - 161⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 69°. Give your answer to 2 decimal places
Answer: 280.07cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 81:18:4 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 63, 70, 92, 47, 64, 57, 81
Answer: Mean = 70.5, Median = 67, Range = 45