Keystones — Capstone
Five GCSE retrieval questions · 4 September 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: x² + 9x - 4
Answer: (x + 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 29cm, angle = 40°. Give your answer to 2 decimal places
Answer: 242.33cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 25:45:81 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 32, 46, 84, 10, 77, 58, 32, 64. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 58, Range = 74