Keystones — Capstone
Five GCSE retrieval questions · 27 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√275
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: x² - 11x - 9
Answer: (x - 11⁄2)² - 157⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 24cm, angle = 49°. Give your answer to 2 decimal places
Answer: 199.24cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 9:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 51, 69, 12, 24, 24, 50, 74. Give your answer to 2 decimal places
Answer: Mean = 43.43, Median = 50, Range = 62