Keystones — Capstone
Five GCSE retrieval questions · 29 November 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√18
Answer: 15√2 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 14
Answer: 2(x - 5)² - 36 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 191.47cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:28:12 -
5. Statistics Averages and range
Find the mean, median and range of: 74, 15, 75, 57, 81, 97, 39, 73. Give your answer to 2 decimal places
Answer: Mean = 63.88, Median = 73.5, Range = 82