Keystones — Capstone
Five GCSE retrieval questions · 6 January 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: x² + 7x - 10
Answer: (x + 7⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 20cm, angle = 76°. Give your answer to 2 decimal places
Answer: 126.14cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 14:35:15 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 58, 34, 72, 83, 39, 65, 81, 92
Answer: Mean = 66, Median = 70, Range = 58