Keystones — Capstone
Five GCSE retrieval questions · 4 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√27
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 11x - 6
Answer: (x - 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 57°. Give your answer to 2 decimal places
Answer: 316.18cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 18:21:35 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 82, 35, 86, 12, 25, 24. Give your answer to 2 decimal places
Answer: Mean = 42.71, Median = 35, Range = 74