Keystones — Capstone
Five GCSE retrieval questions · 23 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 4x² - 32x + 6
Answer: 4(x - 4)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 23cm, angle = 56°. Give your answer to 2 decimal places
Answer: 123.94cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 40:72:81 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 63, 50, 33, 87, 47, 84, 42, 16. Give your answer to 2 decimal places
Answer: Mean = 57.22, Median = 50, Range = 77