Keystones — Capstone
Five GCSE retrieval questions · 12 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: 4x² + 40x + 6
Answer: 4(x + 5)² - 94 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 56°. Give your answer to 2 decimal places
Answer: 139.28cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 77, 35, 50, 88, 32, 36, 95
Answer: Mean = 61.5, Median = 63.5, Range = 63