Keystones — Capstone
Five GCSE retrieval questions · 14 June 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 - 3x + 5
Answer: (x - 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 24cm, angle = 59°. Give your answer to 2 decimal places
Answer: 133.72cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 72:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 80, 35, 27, 88, 80, 32, 65, 76. Give your answer to 2 decimal places
Answer: Mean = 58.44, Median = 65, Range = 61