Keystones — Capstone
Five GCSE retrieval questions · 11 March 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√275
Answer: 25√11 -
2. Algebra Completing the square
Complete the square: 3x² + 24x - 3
Answer: 3(x + 4)² - 51 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 25cm, angle = 66°. Give your answer to 2 decimal places
Answer: 205.55cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 16:6:27 -
5. Statistics Averages and range
Find the mean, median and range of: 12, 40, 28, 18, 68, 40, 44. Give your answer to 2 decimal places
Answer: Mean = 35.71, Median = 40, Range = 56