Keystones — Capstone
Five GCSE retrieval questions · 6 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 4x² + 48x - 6
Answer: 4(x + 6)² - 150 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 30cm, angle = 60°. Give your answer to 2 decimal places
Answer: 207.85cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 72:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 14, 63, 58, 50, 37, 40, 94, 90
Answer: Mean = 58, Median = 58, Range = 80