Keystones — Capstone
Five GCSE retrieval questions · 13 September 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: 3x² - 36x - 8
Answer: 3(x - 6)² - 116 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 29cm, angle = 74°. Give your answer to 2 decimal places
Answer: 348.46cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:12:4 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 16, 68, 78, 52, 55, 42, 82, 15. Give your answer to 2 decimal places
Answer: Mean = 51.44, Median = 55, Range = 67