Keystones — Capstone
Five GCSE retrieval questions · 3 June 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √360
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² + 5x + 3
Answer: (x + 5⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 96.02cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 40:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 91, 37, 54, 27, 22, 92, 42, 41. Give your answer to 2 decimal places
Answer: Mean = 54.22, Median = 42, Range = 70