Keystones — Capstone
Five GCSE retrieval questions · 1 May 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: 2x² + 20x - 6
Answer: 2(x + 5)² - 56 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 27cm, angle = 40°. Give your answer to 2 decimal places
Answer: 156.2cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 56:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 78, 26, 28, 75, 80, 51, 52. Give your answer to 2 decimal places
Answer: Mean = 53.63, Median = 51.5, Range = 54