Keystones — Capstone
Five GCSE retrieval questions · 15 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √550
Answer: 5√22 -
2. Algebra Completing the square
Complete the square: x² - x + 9
Answer: (x - 1⁄2)² + 35⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 52°. Give your answer to 2 decimal places
Answer: 122.93cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 32:20:25 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 97, 17, 82, 46, 37, 38, 35, 26. Give your answer to 2 decimal places
Answer: Mean = 43.11, Median = 37, Range = 87