Keystones — Capstone
Five GCSE retrieval questions · 26 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√54
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 13
Answer: 3(x - 1)² - 16 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 21cm, angle = 71°. Give your answer to 2 decimal places
Answer: 138.99cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 77, 93, 89, 71, 15, 51, 73, 19
Answer: Mean = 62, Median = 71, Range = 78