Keystones — Capstone
Five GCSE retrieval questions · 16 February 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 + 5x + 6
Answer: (x + 5⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 25cm, angle = 57°. Give your answer to 2 decimal places
Answer: 146.77cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 4:28:21 -
5. Statistics Averages and range
Find the mean, median and range of: 40, 67, 62, 88, 21, 42, 15, 90, 39. Give your answer to 2 decimal places
Answer: Mean = 51.56, Median = 42, Range = 75