Keystones — Capstone
Five GCSE retrieval questions · 16 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √686
Answer: 7√14 -
2. Algebra Completing the square
Complete the square: 2x² + 4x + 7
Answer: 2(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 72°. Give your answer to 2 decimal places
Answer: 189.74cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 35:21:12 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 46, 100, 39, 85, 17, 69, 11
Answer: Mean = 57.5, Median = 57.5, Range = 89