Keystones — Capstone
Five GCSE retrieval questions · 31 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² - 3x - 6
Answer: (x - 3⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 40°. Give your answer to 2 decimal places
Answer: 160.7cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 45:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 44, 78, 63, 72, 47, 53, 62. Give your answer to 2 decimal places
Answer: Mean = 53.63, Median = 57.5, Range = 68