Keystones — Capstone
Five GCSE retrieval questions · 1 March 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√50
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 12
Answer: 5(x + 3)² - 57 -
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 7:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 21:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 83, 85, 61, 89, 49, 41. Give your answer to 2 decimal places
Answer: Mean = 60.71, Median = 61, Range = 72