Keystones — Capstone
Five GCSE retrieval questions · 29 July 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √200
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 3x² + 24x + 15
Answer: 3(x + 4)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 20cm, angle = 79°. Give your answer to 2 decimal places
Answer: 274.86cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 15:12:20 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 30, 66, 84, 12, 49, 92, 60, 55. Give your answer to 2 decimal places
Answer: Mean = 55.78, Median = 55, Range = 80