Keystones — Capstone
Five GCSE retrieval questions · 31 December 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 - 5
Answer: (x + 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 30cm, angle = 80°. Give your answer to 2 decimal places
Answer: 354.53cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 27:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 34, 70, 85, 45, 31, 27, 90, 23. Give your answer to 2 decimal places
Answer: Mean = 46.89, Median = 34, Range = 73