Keystones — Capstone
Five GCSE retrieval questions · 9 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 40°. Give your answer to 2 decimal places
Answer: 195.73cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 45:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 64, 84, 14, 31, 20, 72. Give your answer to 2 decimal places
Answer: Mean = 44.71, Median = 31, Range = 70