Keystones — Capstone
Five GCSE retrieval questions · 23 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² - 5x + 12
Answer: (x - 5⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 96.51cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 61, 96, 87, 70, 91, 85, 38, 71. Give your answer to 2 decimal places
Answer: Mean = 74.33, Median = 71, Range = 58