Keystones — Capstone
Five GCSE retrieval questions · 16 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √448
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + x + 11
Answer: (x + 1⁄2)² + 43⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 22cm, angle = 54°. Give your answer to 2 decimal places
Answer: 186.88cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 35:42:18 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 20, 31, 66, 38, 60, 88
Answer: Mean = 50, Median = 47, Range = 68