Keystones — Capstone
Five GCSE retrieval questions · 21 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 7
Answer: 2(x - 4)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 20cm, angle = 51°. Give your answer to 2 decimal places
Answer: 186.52cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 21:56:24 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 14, 23, 54, 20, 59, 82. Give your answer to 2 decimal places
Answer: Mean = 41.71, Median = 40, Range = 68