Keystones — Capstone
Five GCSE retrieval questions · 24 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 2x² - 24x - 11
Answer: 2(x - 6)² - 83 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 16cm, angle = 51°. Give your answer to 2 decimal places
Answer: 142.99cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 4:1. Find a:b:c in its simplest form.
Answer: 28:20:5 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 99, 32, 55, 25, 95, 19, 18, 75. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 55, Range = 81