Keystones — Capstone
Five GCSE retrieval questions · 18 December 2017 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 14
Answer: 5(x + 3)² - 31 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 19cm, angle = 52°. Give your answer to 2 decimal places
Answer: 157.21cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 64:40:45 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 50, 92, 29, 28, 46, 43, 75, 19. Give your answer to 2 decimal places
Answer: Mean = 49.33, Median = 46, Range = 73