Keystones — Capstone
Five GCSE retrieval questions · 13 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√44
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 5x² + 20x - 5
Answer: 5(x + 2)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 64°. Give your answer to 2 decimal places
Answer: 179.31cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 8:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 41, 89, 47, 97, 59, 76, 61, 82. Give your answer to 2 decimal places
Answer: Mean = 69.67, Median = 75, Range = 56