Keystones — Capstone
Five GCSE retrieval questions · 29 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² - 9x - 2
Answer: (x - 9⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 26cm, angle = 57°. Give your answer to 2 decimal places
Answer: 207.15cm² -
4. Ratio Combining two ratios
a:b is 7:3 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 49:21:24 -
5. Statistics Averages and range
Find the mean, median and range of: 84, 98, 92, 64, 13, 23, 21. Give your answer to 2 decimal places
Answer: Mean = 56.43, Median = 64, Range = 85