Keystones — Capstone
Five GCSE retrieval questions · 27 January 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 8
Answer: 3(x + 1)² + 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 51°. Give your answer to 2 decimal places
Answer: 155.04cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 8:5. Find a:b:c in its simplest form.
Answer: 40:56:35 -
5. Statistics Averages and range
Find the mean, median and range of: 66, 75, 16, 30, 92, 71, 31, 93, 15. Give your answer to 2 decimal places
Answer: Mean = 54.33, Median = 66, Range = 78