Keystones — Capstone
Five GCSE retrieval questions · 26 July 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: 5x² + 50x + 6
Answer: 5(x + 5)² - 119 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 75°. Give your answer to 2 decimal places
Answer: 266.11cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 61, 31, 94, 49, 58, 80, 22
Answer: Mean = 57.5, Median = 59.5, Range = 72