Keystones — Capstone
Five GCSE retrieval questions · 7 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 4
Answer: 2(x - 3)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 26cm, angle = 72°. Give your answer to 2 decimal places
Answer: 247.27cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 12, 100, 30, 84, 82, 80, 34, 41. Give your answer to 2 decimal places
Answer: Mean = 53.22, Median = 41, Range = 88