Keystones — Capstone
Five GCSE retrieval questions · 5 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 14
Answer: 5(x - 6)² - 166 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 19cm, angle = 54°. Give your answer to 2 decimal places
Answer: 99.91cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 2:18:81 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 59, 11, 51, 33, 94, 97, 36
Answer: Mean = 51.5, Median = 43.5, Range = 86