Keystones — Capstone
Five GCSE retrieval questions · 26 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√24
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 10
Answer: 5(x + 2)² - 30 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 113.16cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 63:56:64 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 37, 27, 100, 97, 78, 23. Give your answer to 2 decimal places
Answer: Mean = 61.43, Median = 68, Range = 77