Keystones — Capstone
Five GCSE retrieval questions · 8 December 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√28
Answer: 4√7 -
2. Algebra Completing the square
Complete the square: x² + 5x - 5
Answer: (x + 5⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 17cm, angle = 63°. Give your answer to 2 decimal places
Answer: 151.47cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 30:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 89, 93, 46, 83, 78, 32, 27. Give your answer to 2 decimal places
Answer: Mean = 62.63, Median = 65.5, Range = 66