Keystones — Capstone
Five GCSE retrieval questions · 3 March 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√90
Answer: 12√10 -
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 = 16cm, b = 27cm, angle = 79°. Give your answer to 2 decimal places
Answer: 212.03cm² -
4. Ratio Combining two ratios
a:b is 5:9 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 35:63:18 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 93, 36, 69, 50, 18, 18. Give your answer to 2 decimal places
Answer: Mean = 47.71, Median = 50, Range = 75