Keystones — Capstone
Five GCSE retrieval questions · 13 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 3
Answer: 5(x + 2)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 73°. Give your answer to 2 decimal places
Answer: 315.58cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 56:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 15, 96, 22, 63, 84, 36, 43, 47. Give your answer to 2 decimal places
Answer: Mean = 48.44, Median = 43, Range = 81