Keystones — Capstone
Five GCSE retrieval questions · 28 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² - x
Answer: (x - 1⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 67°. Give your answer to 2 decimal places
Answer: 241.63cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 6:42:49 -
5. Statistics Averages and range
Find the mean, median and range of: 72, 82, 27, 27, 47, 86, 68. Give your answer to 2 decimal places
Answer: Mean = 58.43, Median = 68, Range = 59