Keystones — Capstone
Five GCSE retrieval questions · 7 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: 3x² - 24x - 6
Answer: 3(x - 4)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 13cm, angle = 55°. Give your answer to 2 decimal places
Answer: 106.49cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:5. Find a:b:c in its simplest form.
Answer: 81:45:25 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 46, 54, 37, 79, 11, 68. Give your answer to 2 decimal places
Answer: Mean = 48.57, Median = 46, Range = 68