Keystones — Capstone
Five GCSE retrieval questions · 11 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 5x² - 20x - 11
Answer: 5(x - 2)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 22cm, angle = 77°. Give your answer to 2 decimal places
Answer: 139.33cm² -
4. Ratio Combining two ratios
a:b is 1:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 5:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 20, 72, 72, 73, 62, 92, 31
Answer: Mean = 61, Median = 69, Range = 72