Keystones — Capstone
Five GCSE retrieval questions · 13 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √864
Answer: 12√6 -
2. Algebra Completing the square
Complete the square: 2x² + 8x - 14
Answer: 2(x + 2)² - 22 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 18cm, angle = 80°. Give your answer to 2 decimal places
Answer: 221.58cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 6:21:49 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 87, 90, 27, 25, 41, 48. Give your answer to 2 decimal places
Answer: Mean = 57.29, Median = 48, Range = 65