Keystones — Capstone
Five GCSE retrieval questions · 13 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √343
Answer: 7√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 6
Answer: (x - 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 14cm, angle = 64°. Give your answer to 2 decimal places
Answer: 157.29cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 14:63:45 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 66, 34, 96, 83, 88, 21, 56, 46. Give your answer to 2 decimal places
Answer: Mean = 61.67, Median = 65, Range = 75