Keystones — Capstone
Five GCSE retrieval questions · 9 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√250
Answer: 25√10 -
2. Algebra Completing the square
Complete the square: x² + 11x - 12
Answer: (x + 11⁄2)² - 169⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 28cm, angle = 44°. Give your answer to 2 decimal places
Answer: 272.31cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 81:18:2 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 54, 77, 99, 21, 50, 75, 53, 66. Give your answer to 2 decimal places
Answer: Mean = 60.89, Median = 54, Range = 78