Keystones — Capstone
Five GCSE retrieval questions · 16 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: 4x² + 32x - 14
Answer: 4(x + 4)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 50°. Give your answer to 2 decimal places
Answer: 209.13cm² -
4. Ratio Combining two ratios
a:b is 7:6 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 21:18:14 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 52, 31, 14, 77, 27, 78, 73. Give your answer to 2 decimal places
Answer: Mean = 48.13, Median = 42.5, Range = 64