Keystones — Capstone
Five GCSE retrieval questions · 10 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√90
Answer: 6√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 8
Answer: (x - 3⁄2)² + 23⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 30cm, angle = 72°. Give your answer to 2 decimal places
Answer: 185.46cm² -
4. Ratio Combining two ratios
a:b is 3:7 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 12:28:35 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 60, 16, 30, 73, 79, 81. Give your answer to 2 decimal places
Answer: Mean = 60.86, Median = 73, Range = 71