Keystones — Capstone
Five GCSE retrieval questions · 5 November 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 26cm, angle = 78°. Give your answer to 2 decimal places
Answer: 178.02cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 35:21:3 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 52, 14, 41, 19, 22, 20, 97, 79. Give your answer to 2 decimal places
Answer: Mean = 39.56, Median = 22, Range = 85