Keystones — Capstone
Five GCSE retrieval questions · 7 December 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√90
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: x² - 5x + 2
Answer: (x - 5⁄2)² - 17⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 18cm, angle = 78°. Give your answer to 2 decimal places
Answer: 158.46cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 27:72:64 -
5. Statistics Averages and range
Find the mean, median and range of: 49, 63, 39, 43, 17, 92, 45, 31. Give your answer to 2 decimal places
Answer: Mean = 47.38, Median = 44, Range = 75