Keystones — Capstone
Five GCSE retrieval questions · 14 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 13
Answer: 4(x - 2)² - 3 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 19cm, angle = 69°. Give your answer to 2 decimal places
Answer: 177.38cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:20:36 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 64, 75, 88, 36, 29, 63, 10, 56. Give your answer to 2 decimal places
Answer: Mean = 52.67, Median = 56, Range = 78