Keystones — Capstone
Five GCSE retrieval questions · 4 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 13
Answer: 5(x + 3)² - 58 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 69°. Give your answer to 2 decimal places
Answer: 230.59cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:3. Find a:b:c in its simplest form.
Answer: 4:10:15 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 54, 44, 14, 37, 37, 41, 50, 62. Give your answer to 2 decimal places
Answer: Mean = 43.67, Median = 44, Range = 48