Keystones — Capstone
Five GCSE retrieval questions · 14 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √112
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 7x - 4
Answer: (x + 7⁄2)² - 65⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 18cm, angle = 64°. Give your answer to 2 decimal places
Answer: 218.41cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 35:10:14 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 31, 33, 74, 74, 41, 92
Answer: Mean = 63, Median = 74, Range = 65