Keystones — Capstone
Five GCSE retrieval questions · 13 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 3x² - 30x + 13
Answer: 3(x - 5)² - 62 -
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 7:3 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 35:15:27 -
5. Statistics Averages and range
Find the mean, median and range of: 23, 66, 98, 96, 60, 30, 80. Give your answer to 2 decimal places
Answer: Mean = 64.71, Median = 66, Range = 75