Keystones — Capstone
Five GCSE retrieval questions · 1 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 5x² + 10x - 7
Answer: 5(x + 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 17cm, angle = 49°. Give your answer to 2 decimal places
Answer: 186.04cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 6:30:25 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 54, 88, 36, 19, 61, 92, 40, 81
Answer: Mean = 61, Median = 61, Range = 73