Keystones — Capstone
Five GCSE retrieval questions · 4 October 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√160
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² + 5x - 12
Answer: (x + 5⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 16cm, angle = 67°. Give your answer to 2 decimal places
Answer: 154.64cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 2:7. Find a:b:c in its simplest form.
Answer: 18:14:49 -
5. Statistics Averages and range
Find the mean, median and range of: 29, 54, 82, 62, 79, 39, 73. Give your answer to 2 decimal places
Answer: Mean = 59.71, Median = 62, Range = 53