Keystones — Capstone
Five GCSE retrieval questions · 27 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√112
Answer: 20√7 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 12
Answer: 2(x - 6)² - 60 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 28cm, angle = 59°. Give your answer to 2 decimal places
Answer: 300.01cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 12:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 63, 45, 57, 29, 65, 19, 60, 72
Answer: Mean = 51.25, Median = 58.5, Range = 53