Keystones — Capstone
Five GCSE retrieval questions · 11 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √468
Answer: 6√13 -
2. Algebra Completing the square
Complete the square: x² - 7x + 4
Answer: (x - 7⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 61°. Give your answer to 2 decimal places
Answer: 229.59cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:15:6 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 89, 47, 75, 82, 14, 26. Give your answer to 2 decimal places
Answer: Mean = 57.29, Median = 68, Range = 75