Keystones — Capstone
Five GCSE retrieval questions · 18 September 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 2x² - 4x + 11
Answer: 2(x - 1)² + 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 70°. Give your answer to 2 decimal places
Answer: 151.29cm² -
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: 37, 43, 15, 36, 82, 15, 82, 95, 54
Answer: Mean = 51, Median = 43, Range = 80