Keystones — Capstone
Five GCSE retrieval questions · 4 April 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √72
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² + 7x + 8
Answer: (x + 7⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 64°. Give your answer to 2 decimal places
Answer: 222cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 25:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 12, 54, 88, 80, 95, 71. Give your answer to 2 decimal places
Answer: Mean = 65.71, Median = 71, Range = 83