Keystones — Capstone
Five GCSE retrieval questions · 12 February 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√90
Answer: 15√10 -
2. Algebra Completing the square
Complete the square: 2x² - 12x + 8
Answer: 2(x - 3)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 62°. Give your answer to 2 decimal places
Answer: 203.08cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 64:72:45 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 23, 14, 54, 99, 25, 26, 35, 48. Give your answer to 2 decimal places
Answer: Mean = 45.33, Median = 35, Range = 85