Keystones — Capstone
Five GCSE retrieval questions · 26 June 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √432
Answer: 12√3 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 4
Answer: 4(x - 6)² - 140 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 16cm, angle = 49°. Give your answer to 2 decimal places
Answer: 78.49cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 63:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 16, 78, 74, 51, 63, 98, 57, 17, 41
Answer: Mean = 55, Median = 57, Range = 82