Keystones — Capstone
Five GCSE retrieval questions · 7 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 14
Answer: 3(x + 5)² - 89 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 80°. Give your answer to 2 decimal places
Answer: 217.64cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 42:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 39, 33, 60, 13, 65, 34, 46. Give your answer to 2 decimal places
Answer: Mean = 40.88, Median = 38, Range = 52