Keystones — Capstone
Five GCSE retrieval questions · 10 February 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: x² - 3x + 2
Answer: (x - 3⁄2)² - 1⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 18cm, angle = 40°. Give your answer to 2 decimal places
Answer: 138.84cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 24:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 98, 49, 25, 15, 63, 12, 65, 10. Give your answer to 2 decimal places
Answer: Mean = 42.13, Median = 37, Range = 88