Keystones — Capstone
Five GCSE retrieval questions · 2 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √216
Answer: 6√6 -
2. Algebra Completing the square
Complete the square: 5x² + 60x + 6
Answer: 5(x + 6)² - 174 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 29cm, angle = 78°. Give your answer to 2 decimal places
Answer: 283.66cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:9. Find a:b:c in its simplest form.
Answer: 21:14:18 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 29, 72, 50, 32, 45, 38. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 40, Range = 43