Keystones — Capstone
Five GCSE retrieval questions · 28 September 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
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 = 26cm, b = 25cm, angle = 72°. Give your answer to 2 decimal places
Answer: 309.09cm² -
4. Ratio Combining two ratios
a:b is 7:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 21:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 87, 26, 45, 17, 73, 55, 28. Give your answer to 2 decimal places
Answer: Mean = 47.29, Median = 45, Range = 70