Keystones — Capstone
Five GCSE retrieval questions · 2 April 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 7
Answer: 5(x + 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 24cm, angle = 68°. Give your answer to 2 decimal places
Answer: 333.79cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 3:15:5 -
5. Statistics Averages and range
Find the mean, median and range of: 41, 12, 78, 20, 66, 95, 64, 100, 85. Give your answer to 2 decimal places
Answer: Mean = 62.33, Median = 66, Range = 88