Keystones — Capstone
Five GCSE retrieval questions · 21 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √242
Answer: 11√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 2
Answer: (x - 7⁄2)² - 41⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 15cm, angle = 40°. Give your answer to 2 decimal places
Answer: 130.16cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 54:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 61, 66, 81, 56, 20, 48. Give your answer to 2 decimal places
Answer: Mean = 51.57, Median = 56, Range = 61