Keystones — Capstone
Five GCSE retrieval questions · 20 December 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √384
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 2x² - 8x + 5
Answer: 2(x - 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 28cm, angle = 45°. Give your answer to 2 decimal places
Answer: 237.59cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 14:35:45 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 48, 94, 55, 90, 29, 29, 98, 48. Give your answer to 2 decimal places
Answer: Mean = 63.89, Median = 55, Range = 69