Keystones — Capstone
Five GCSE retrieval questions · 30 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² - 18x + 13
Answer: 3(x - 3)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 79°. Give your answer to 2 decimal places
Answer: 184.06cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 90, 14, 42, 47, 11, 69, 57
Answer: Mean = 47, Median = 46.5, Range = 79