Keystones — Capstone
Five GCSE retrieval questions · 21 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √275
Answer: 5√11 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 12
Answer: 2(x - 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 159.02cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 32:36:81 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 19, 83, 79, 84, 31, 15. Give your answer to 2 decimal places
Answer: Mean = 57.14, Median = 79, Range = 74