Keystones — Capstone
Five GCSE retrieval questions · 17 May 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√99
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 5x² + 50x - 11
Answer: 5(x + 5)² - 136 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 64°. Give your answer to 2 decimal places
Answer: 128.08cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 56:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 83, 53, 89, 94, 18, 29, 47, 28. Give your answer to 2 decimal places
Answer: Mean = 56.56, Median = 53, Range = 76