Keystones — Capstone
Five GCSE retrieval questions · 2 February 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: x² - 3x + 3
Answer: (x - 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 14cm, angle = 55°. Give your answer to 2 decimal places
Answer: 160.55cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:18:16 -
5. Statistics Averages and range
Find the mean, median and range of: 58, 68, 40, 28, 46, 33, 18. Give your answer to 2 decimal places
Answer: Mean = 41.57, Median = 40, Range = 50