Keystones — Capstone
Five GCSE retrieval questions · 31 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √704
Answer: 8√11 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 6
Answer: 2(x - 2)² - 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 27cm, angle = 57°. Give your answer to 2 decimal places
Answer: 169.83cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 32:56:63 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 48, 20, 40, 85, 28, 20. Give your answer to 2 decimal places
Answer: Mean = 46.29, Median = 40, Range = 65