Keystones — Capstone
Five GCSE retrieval questions · 7 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√90
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 7
Answer: 3(x - 2)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 18cm, angle = 72°. Give your answer to 2 decimal places
Answer: 171.19cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:1. Find a:b:c in its simplest form.
Answer: 7:14:2 -
5. Statistics Averages and range
Find the mean, median and range of: 89, 91, 73, 25, 47, 79, 27, 50. Give your answer to 2 decimal places
Answer: Mean = 60.13, Median = 61.5, Range = 66