Keystones — Capstone
Five GCSE retrieval questions · 6 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 4x² + 24x - 9
Answer: 4(x + 3)² - 45 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 24cm, angle = 62°. Give your answer to 2 decimal places
Answer: 286.08cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 24:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 13, 75, 45, 89, 58, 12, 68, 17. Give your answer to 2 decimal places
Answer: Mean = 51.33, Median = 58, Range = 77