Keystones — Capstone
Five GCSE retrieval questions · 5 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√80
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: x² + 9x - 3
Answer: (x + 9⁄2)² - 93⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 12cm, angle = 70°. Give your answer to 2 decimal places
Answer: 112.76cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:21:56 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 34, 99, 36, 40, 34, 72. Give your answer to 2 decimal places
Answer: Mean = 50.43, Median = 38, Range = 65