Keystones — Capstone
Five GCSE retrieval questions · 20 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 4
Answer: 3(x - 2)² - 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 52°. Give your answer to 2 decimal places
Answer: 100.47cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 5:2. Find a:b:c in its simplest form.
Answer: 5:10:4 -
5. Statistics Averages and range
Find the mean, median and range of: 11, 15, 64, 65, 59, 34, 12, 74
Answer: Mean = 41.75, Median = 46.5, Range = 63