Keystones — Capstone
Five GCSE retrieval questions · 8 December 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: x² - 3x - 1
Answer: (x - 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 51°. Give your answer to 2 decimal places
Answer: 272cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 33, 35, 61, 18, 68, 87, 54
Answer: Mean = 54.25, Median = 57.5, Range = 69