Keystones — Capstone
Five GCSE retrieval questions · 27 April 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √160
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 26cm, angle = 46°. Give your answer to 2 decimal places
Answer: 215.08cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 10:15:3 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 51, 72, 61, 90, 16, 69. Give your answer to 2 decimal places
Answer: Mean = 63.14, Median = 69, Range = 74