Keystones — Capstone
Five GCSE retrieval questions · 7 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√63
Answer: 12√7 -
2. Algebra Completing the square
Complete the square: x² - 7x - 12
Answer: (x - 7⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 17cm, angle = 80°. Give your answer to 2 decimal places
Answer: 133.93cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 54:45:5 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 42, 40, 41, 67, 10, 82. Give your answer to 2 decimal places
Answer: Mean = 53.71, Median = 42, Range = 84