Keystones — Capstone
Five GCSE retrieval questions · 24 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 4x² + 48x + 14
Answer: 4(x + 6)² - 130 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 25cm, angle = 73°. Give your answer to 2 decimal places
Answer: 274.94cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 20:24:21 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 64, 94, 88, 49, 33, 50, 93, 10. Give your answer to 2 decimal places
Answer: Mean = 60.33, Median = 62, Range = 84