Keystones — Capstone
Five GCSE retrieval questions · 30 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √539
Answer: 7√11 -
2. Algebra Completing the square
Complete the square: x² - 3x + 10
Answer: (x - 3⁄2)² + 31⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 25cm, angle = 60°. Give your answer to 2 decimal places
Answer: 216.51cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 36:63:7 -
5. Statistics Averages and range
Find the mean, median and range of: 34, 80, 92, 78, 38, 76, 29, 95, 75. Give your answer to 2 decimal places
Answer: Mean = 66.33, Median = 76, Range = 66