Keystones — Capstone
Five GCSE retrieval questions · 22 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² - 30x + 8
Answer: 5(x - 3)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 28cm, angle = 67°. Give your answer to 2 decimal places
Answer: 244.85cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 36:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 48, 40, 59, 34, 51, 74, 79, 48. Give your answer to 2 decimal places
Answer: Mean = 55.89, Median = 51, Range = 45