Keystones — Capstone
Five GCSE retrieval questions · 16 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 9x + 6
Answer: (x - 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 27cm, angle = 53°. Give your answer to 2 decimal places
Answer: 269.54cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 15:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 65, 97, 62, 74, 74, 90, 93, 14. Give your answer to 2 decimal places
Answer: Mean = 71.13, Median = 74, Range = 83