Keystones — Capstone
Five GCSE retrieval questions · 15 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: x² - x - 5
Answer: (x - 1⁄2)² - 21⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 22cm, angle = 76°. Give your answer to 2 decimal places
Answer: 224.14cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 48, 73, 79, 47, 83, 62, 46, 16
Answer: Mean = 56.75, Median = 55, Range = 67