Keystones — Capstone
Five GCSE retrieval questions · 4 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 12
Answer: (x - 9⁄2)² - 33⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 153.57cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 64:56:21 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 70, 78, 90, 85, 52, 22
Answer: Mean = 68, Median = 78, Range = 68