Keystones — Capstone
Five GCSE retrieval questions · 7 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √98
Answer: 7√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 8
Answer: 2(x + 4)² - 24 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 14cm, angle = 80°. Give your answer to 2 decimal places
Answer: 158.55cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:12:9 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 83, 64, 31, 87, 66, 87
Answer: Mean = 74, Median = 83, Range = 69