Keystones — Capstone
Five GCSE retrieval questions · 1 February 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 9
Answer: 4(x - 2)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 47°. Give your answer to 2 decimal places
Answer: 138.96cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 49:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 61, 22, 73, 54, 20, 15, 80
Answer: Mean = 46.75, Median = 51.5, Range = 65