Keystones — Capstone
Five GCSE retrieval questions · 27 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 5
Answer: 2(x + 5)² - 55 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 63°. Give your answer to 2 decimal places
Answer: 144.34cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 28:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 41, 38, 67, 47, 69, 54, 54. Give your answer to 2 decimal places
Answer: Mean = 53.38, Median = 54, Range = 31