Keystones — Capstone
Five GCSE retrieval questions · 19 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 5x² - 60x + 11
Answer: 5(x - 6)² - 169 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 69°. Give your answer to 2 decimal places
Answer: 168.04cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:15:40 -
5. Statistics Averages and range
Find the mean, median and range of: 22, 77, 91, 67, 76, 88, 49. Give your answer to 2 decimal places
Answer: Mean = 67.14, Median = 76, Range = 69