Keystones — Capstone
Five GCSE retrieval questions · 4 April 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 233.14cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 21:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 16, 79, 60, 12, 51, 12. Give your answer to 2 decimal places
Answer: Mean = 46.14, Median = 51, Range = 81