Keystones — Capstone
Five GCSE retrieval questions · 27 December 2015 · 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 + 2
Answer: (x + 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 13cm, angle = 51°. Give your answer to 2 decimal places
Answer: 116.18cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 49:56:48 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 15, 52, 100, 68, 79, 86, 18, 66. Give your answer to 2 decimal places
Answer: Mean = 56.11, Median = 66, Range = 85