Keystones — Capstone
Five GCSE retrieval questions · 14 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 78°. Give your answer to 2 decimal places
Answer: 193.67cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 21:35:10 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 33, 16, 13, 41, 35, 10, 53
Answer: Mean = 31.5, Median = 34, Range = 43