Keystones — Capstone
Five GCSE retrieval questions · 20 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √375
Answer: 5√15 -
2. Algebra Completing the square
Complete the square: 2x² - 16x - 9
Answer: 2(x - 4)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 26cm, angle = 44°. Give your answer to 2 decimal places
Answer: 261.89cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 6:14:35 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 18, 27, 23, 22, 89, 71, 84. Give your answer to 2 decimal places
Answer: Mean = 43.13, Median = 25, Range = 78