Keystones — Capstone
Five GCSE retrieval questions · 3 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 15
Answer: 3(x + 5)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 15cm, angle = 43°. Give your answer to 2 decimal places
Answer: 66.49cm² -
4. Ratio Combining two ratios
a:b is 9:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 27:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 67, 85, 48, 64, 96, 20, 47
Answer: Mean = 60.75, Median = 61.5, Range = 76