Keystones — Capstone
Five GCSE retrieval questions · 17 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 15
Answer: 4(x + 4)² - 49 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 25cm, angle = 65°. Give your answer to 2 decimal places
Answer: 181.26cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 9:7. Find a:b:c in its simplest form.
Answer: 63:36:28 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 42, 31, 11, 66, 95, 58, 83. Give your answer to 2 decimal places
Answer: Mean = 59.63, Median = 62, Range = 84