Keystones — Capstone
Five GCSE retrieval questions · 18 October 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√80
Answer: 16√5 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 11
Answer: 3(x + 1)² + 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 29cm, angle = 47°. Give your answer to 2 decimal places
Answer: 307.53cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 81:45:20 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 51, 37, 66, 14, 83, 77, 79
Answer: Mean = 60.75, Median = 71.5, Range = 69