Keystones — Capstone
Five GCSE retrieval questions · 6 May 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: x² - 3x - 12
Answer: (x - 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 12cm, angle = 51°. Give your answer to 2 decimal places
Answer: 83.93cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 16:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 32, 18, 26, 66, 68, 34, 67, 93
Answer: Mean = 50.5, Median = 50, Range = 75