Keystones — Capstone
Five GCSE retrieval questions · 29 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √150
Answer: 5√6 -
2. Algebra Completing the square
Complete the square: x² + 5x + 4
Answer: (x + 5⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 21cm, angle = 67°. Give your answer to 2 decimal places
Answer: 164.31cm² -
4. Ratio Combining two ratios
a:b is 5:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 25:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 83, 28, 27, 73, 46, 30. Give your answer to 2 decimal places
Answer: Mean = 53.43, Median = 46, Range = 60