Keystones — Capstone
Five GCSE retrieval questions · 5 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: x² + 3x + 5
Answer: (x + 3⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 19cm, angle = 67°. Give your answer to 2 decimal places
Answer: 244.85cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 35:15:12 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 38, 23, 53, 92, 59, 28, 90. Give your answer to 2 decimal places
Answer: Mean = 50.63, Median = 45.5, Range = 70