Keystones — Capstone
Five GCSE retrieval questions · 4 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: 4x² - 8x + 6
Answer: 4(x - 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 19cm, angle = 53°. Give your answer to 2 decimal places
Answer: 197.26cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 9:36:32 -
5. Statistics Averages and range
Find the mean, median and range of: 44, 36, 74, 20, 16, 46, 37
Answer: Mean = 39, Median = 37, Range = 58