Keystones — Capstone
Five GCSE retrieval questions · 7 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √735
Answer: 7√15 -
2. Algebra Completing the square
Complete the square: x² - 7x + 3
Answer: (x - 7⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 53°. Give your answer to 2 decimal places
Answer: 231.6cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 15:35:14 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 98, 82, 41, 100, 17, 37, 54. Give your answer to 2 decimal places
Answer: Mean = 64.88, Median = 68, Range = 83