Keystones — Capstone
Five GCSE retrieval questions · 29 May 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √350
Answer: 5√14 -
2. Algebra Completing the square
Complete the square: 2x² + 24x - 6
Answer: 2(x + 6)² - 78 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 29cm, angle = 50°. Give your answer to 2 decimal places
Answer: 155.51cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 63:14:6 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 60, 25, 54, 24, 90, 29, 65, 22. Give your answer to 2 decimal places
Answer: Mean = 47.89, Median = 54, Range = 68