Keystones — Capstone
Five GCSE retrieval questions · 3 August 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√40
Answer: 8√10 -
2. Algebra Completing the square
Complete the square: x² - 5x + 7
Answer: (x - 5⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 21cm, angle = 48°. Give your answer to 2 decimal places
Answer: 156.06cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 5:40:72 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 83, 23, 73, 19, 37, 22. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 37, Range = 71