Keystones — Capstone
Five GCSE retrieval questions · 25 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√45
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 5x² + 30x - 5
Answer: 5(x + 3)² - 50 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 29cm, angle = 46°. Give your answer to 2 decimal places
Answer: 135.6cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 43, 50, 62, 34, 86, 31, 79, 29. Give your answer to 2 decimal places
Answer: Mean = 51.11, Median = 46, Range = 57