Keystones — Capstone
Five GCSE retrieval questions · 8 August 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
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 = 24cm, b = 16cm, angle = 55°. Give your answer to 2 decimal places
Answer: 157.28cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 9:24:16 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 62, 100, 27, 46, 29, 21, 23, 78. Give your answer to 2 decimal places
Answer: Mean = 52.89, Median = 46, Range = 79