Keystones — Capstone
Five GCSE retrieval questions · 22 October 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √304
Answer: 4√19 -
2. Algebra Completing the square
Complete the square: x² + 7x - 6
Answer: (x + 7⁄2)² - 73⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 54°. Give your answer to 2 decimal places
Answer: 131.06cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:28:32 -
5. Statistics Averages and range
Find the mean, median and range of: 62, 57, 94, 13, 66, 91, 82, 98, 90. Give your answer to 2 decimal places
Answer: Mean = 72.56, Median = 82, Range = 85