Keystones — Capstone
Five GCSE retrieval questions · 9 November 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √245
Answer: 7√5 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 13
Answer: 3(x + 4)² - 61 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 12cm, angle = 44°. Give your answer to 2 decimal places
Answer: 87.53cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 18:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 64, 74, 87, 96, 21, 53, 21, 19. Give your answer to 2 decimal places
Answer: Mean = 54.38, Median = 58.5, Range = 77