Keystones — Capstone
Five GCSE retrieval questions · 26 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√48
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: x² - 9x - 4
Answer: (x - 9⁄2)² - 97⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 68°. Give your answer to 2 decimal places
Answer: 155.77cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 45:10:16 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 12, 80, 63, 62, 18, 53. Give your answer to 2 decimal places
Answer: Mean = 55.43, Median = 62, Range = 88