Keystones — Capstone
Five GCSE retrieval questions · 28 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
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 = 28cm, b = 22cm, angle = 75°. Give your answer to 2 decimal places
Answer: 297.51cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 16, 51, 67, 79, 77, 31. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 67, Range = 65