Keystones — Capstone
Five GCSE retrieval questions · 5 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 9
Answer: 3(x - 1)² - 12 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 29cm, angle = 59°. Give your answer to 2 decimal places
Answer: 298.29cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 9:63:49 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 77, 60, 96, 35, 97, 12, 45
Answer: Mean = 62.75, Median = 68.5, Range = 85