Keystones — Capstone
Five GCSE retrieval questions · 1 September 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√250
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 43°. Give your answer to 2 decimal places
Answer: 138.cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 49:56:32 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 29, 73, 99, 60, 11, 67, 92, 33. Give your answer to 2 decimal places
Answer: Mean = 57.22, Median = 60, Range = 88