Keystones — Capstone
Five GCSE retrieval questions · 30 July 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√12
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 5
Answer: 5(x + 1)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 60°. Give your answer to 2 decimal places
Answer: 110.42cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 71, 27, 17, 47, 52, 67, 47, 53
Answer: Mean = 49, Median = 52, Range = 54