Keystones — Capstone
Five GCSE retrieval questions · 2 October 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√8
Answer: 6√2 -
2. Algebra Completing the square
Complete the square: x² - 7x + 11
Answer: (x - 7⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 27cm, angle = 64°. Give your answer to 2 decimal places
Answer: 230.54cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 4:10:35 -
5. Statistics Averages and range
Find the mean, median and range of: 15, 45, 90, 66, 67, 91, 73, 39, 14. Give your answer to 2 decimal places
Answer: Mean = 55.56, Median = 66, Range = 77