Keystones — Capstone
Five GCSE retrieval questions · 13 August 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: x² - 11x + 10
Answer: (x - 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 70°. Give your answer to 2 decimal places
Answer: 186.06cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 25:35:28 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 22, 57, 27, 13, 93, 49, 50, 18
Answer: Mean = 40, Median = 31, Range = 80