Keystones — Capstone
Five GCSE retrieval questions · 21 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√28
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 3x - 8
Answer: (x - 3⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 110.46cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 40:35:7 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 90, 72, 72, 19, 36, 100, 22, 17. Give your answer to 2 decimal places
Answer: Mean = 57.89, Median = 72, Range = 83