Keystones — Capstone
Five GCSE retrieval questions · 1 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 4x² - 40x + 9
Answer: 4(x - 5)² - 91 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 18cm, angle = 53°. Give your answer to 2 decimal places
Answer: 107.82cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 35:20:24 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 89, 75, 93, 29, 50, 28. Give your answer to 2 decimal places
Answer: Mean = 56.71, Median = 50, Range = 65