Keystones — Capstone
Five GCSE retrieval questions · 24 June 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√20
Answer: 6√5 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 8
Answer: 2(x - 5)² - 42 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 27cm, angle = 49°. Give your answer to 2 decimal places
Answer: 163.02cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 11, 98, 50, 51, 66, 41, 56. Give your answer to 2 decimal places
Answer: Mean = 55.38, Median = 53.5, Range = 87