Keystones — Capstone
Five GCSE retrieval questions · 15 July 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 3x - 5
Answer: (x - 3⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 29cm, angle = 45°. Give your answer to 2 decimal places
Answer: 184.55cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 30:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 26, 40, 82, 68, 53, 86, 64, 36. Give your answer to 2 decimal places
Answer: Mean = 57.11, Median = 59, Range = 60