Keystones — Capstone
Five GCSE retrieval questions · 8 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √224
Answer: 4√14 -
2. Algebra Completing the square
Complete the square: x² - 9x + 8
Answer: (x - 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 26cm, angle = 58°. Give your answer to 2 decimal places
Answer: 143.32cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 9:36:4 -
5. Statistics Averages and range
Find the mean, median and range of: 60, 82, 46, 23, 93, 74, 88, 13. Give your answer to 2 decimal places
Answer: Mean = 59.88, Median = 67, Range = 80