Keystones — Capstone
Five GCSE retrieval questions · 19 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √792
Answer: 6√22 -
2. Algebra Completing the square
Complete the square: x² + x + 7
Answer: (x + 1⁄2)² + 27⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 61°. Give your answer to 2 decimal places
Answer: 367.34cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:20:16 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 100, 15, 70, 80, 62, 52, 36, 77. Give your answer to 2 decimal places
Answer: Mean = 56.22, Median = 62, Range = 86