Keystones — Capstone
Five GCSE retrieval questions · 17 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√176
Answer: 16√11 -
2. Algebra Completing the square
Complete the square: x² + 11x + 1
Answer: (x + 11⁄2)² - 117⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 338.06cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 20:15:9 -
5. Statistics Averages and range
Find the mean, median and range of: 20, 96, 92, 39, 23, 50, 27, 59, 29. Give your answer to 2 decimal places
Answer: Mean = 48.33, Median = 39, Range = 76