Keystones — Capstone
Five GCSE retrieval questions · 8 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 14
Answer: 2(x - 4)² - 18 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 48°. Give your answer to 2 decimal places
Answer: 141.2cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 45:10:18 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 12, 42, 22, 31, 32, 15, 66, 60. Give your answer to 2 decimal places
Answer: Mean = 37.33, Median = 32, Range = 54