Keystones — Capstone
Five GCSE retrieval questions · 15 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 1
Answer: 5(x - 2)² - 21 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 72°. Give your answer to 2 decimal places
Answer: 317.18cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 76, 93, 36, 36, 86, 32, 85
Answer: Mean = 57.25, Median = 56, Range = 79