Keystones — Capstone
Five GCSE retrieval questions · 26 January 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √32
Answer: 4√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 8
Answer: 2(x + 4)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 16cm, angle = 74°. Give your answer to 2 decimal places
Answer: 138.42cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 28:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 98, 22, 35, 28, 86, 55, 25. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 45, Range = 76