Keystones — Capstone
Five GCSE retrieval questions · 9 March 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 2x² + 8x + 4
Answer: 2(x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 56°. Give your answer to 2 decimal places
Answer: 220.52cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 12:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 76, 82, 36, 15, 80, 14, 40, 63
Answer: Mean = 50.75, Median = 51.5, Range = 68