Keystones — Capstone
Five GCSE retrieval questions · 13 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - x - 7
Answer: (x - 1⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 21cm, angle = 41°. Give your answer to 2 decimal places
Answer: 103.33cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 33, 49, 33, 79, 83, 100, 73, 55. Give your answer to 2 decimal places
Answer: Mean = 63.13, Median = 64, Range = 67