Keystones — Capstone
Five GCSE retrieval questions · 24 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 5x² - 20x + 7
Answer: 5(x - 2)² - 13 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 57°. Give your answer to 2 decimal places
Answer: 141.74cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 88, 36, 25, 93, 24, 40. Give your answer to 2 decimal places
Answer: Mean = 48.14, Median = 36, Range = 69