Keystones — Capstone
Five GCSE retrieval questions · 21 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√99
Answer: 12√11 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 5
Answer: 3(x + 5)² - 70 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 70°. Give your answer to 2 decimal places
Answer: 239.62cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 35:15:24 -
5. Statistics Averages and range
Find the mean, median and range of: 93, 86, 40, 32, 72, 89, 88, 19. Give your answer to 2 decimal places
Answer: Mean = 64.88, Median = 79, Range = 74