Keystones — Capstone
Five GCSE retrieval questions · 20 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 3
Answer: (x - 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 13cm, angle = 75°. Give your answer to 2 decimal places
Answer: 150.68cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 70, 54, 15, 16, 98, 99
Answer: Mean = 61, Median = 70, Range = 84