Keystones — Capstone
Five GCSE retrieval questions · 17 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: x² - x + 1
Answer: (x - 1⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 28cm, angle = 43°. Give your answer to 2 decimal places
Answer: 114.58cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 18:21:14 -
5. Statistics Averages and range
Find the mean, median and range of: 78, 11, 66, 37, 90, 31, 13. Give your answer to 2 decimal places
Answer: Mean = 46.57, Median = 37, Range = 79