Keystones — Capstone
Five GCSE retrieval questions · 6 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√12
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + x - 9
Answer: (x + 1⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 60°. Give your answer to 2 decimal places
Answer: 326.49cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 22, 70, 31, 15, 42, 31, 34, 74. Give your answer to 2 decimal places
Answer: Mean = 38.11, Median = 31, Range = 59