Keystones — Capstone
Five GCSE retrieval questions · 2 November 2017 · 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 - 12
Answer: (x + 3⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 22cm, angle = 58°. Give your answer to 2 decimal places
Answer: 279.86cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 40:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 72, 73, 99, 14, 24, 44, 15, 57. Give your answer to 2 decimal places
Answer: Mean = 46.11, Median = 44, Range = 85