Keystones — Capstone
Five GCSE retrieval questions · 28 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: 2x² + 12x - 15
Answer: 2(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 25cm, angle = 68°. Give your answer to 2 decimal places
Answer: 289.74cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 20:35:63 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 50, 38, 26, 40, 40, 83, 67, 66. Give your answer to 2 decimal places
Answer: Mean = 47.22, Median = 40, Range = 68