Keystones — Capstone
Five GCSE retrieval questions · 28 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √208
Answer: 4√13 -
2. Algebra Completing the square
Complete the square: x² + 5x - 3
Answer: (x + 5⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 42°. Give your answer to 2 decimal places
Answer: 144.53cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:1. Find a:b:c in its simplest form.
Answer: 18:10:5 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 83, 68, 95, 23, 19, 72, 54
Answer: Mean = 57.5, Median = 61, Range = 76