Keystones — Capstone
Five GCSE retrieval questions · 12 September 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √720
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 11
Answer: 5(x + 1)² + 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 80°. Give your answer to 2 decimal places
Answer: 261.96cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 14:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 14, 88, 57, 67, 20, 68, 24, 89, 86
Answer: Mean = 57, Median = 67, Range = 75