Keystones — Capstone
Five GCSE retrieval questions · 5 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √640
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 12
Answer: 5(x - 6)² - 168 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 19cm, angle = 58°. Give your answer to 2 decimal places
Answer: 120.85cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 5:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 100, 39, 52, 83, 36, 85. Give your answer to 2 decimal places
Answer: Mean = 68.43, Median = 83, Range = 64