Keystones — Capstone
Five GCSE retrieval questions · 21 June 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √294
Answer: 7√6 -
2. Algebra Completing the square
Complete the square: 2x² + 4x - 5
Answer: 2(x + 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 43°. Give your answer to 2 decimal places
Answer: 150.72cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 95, 94, 48, 20, 10, 43, 66, 26, 78. Give your answer to 2 decimal places
Answer: Mean = 53.33, Median = 48, Range = 85