Keystones — Capstone
Five GCSE retrieval questions · 20 May 2015 · 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 + 5
Answer: 3(x + 4)² - 43 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 13cm, angle = 49°. Give your answer to 2 decimal places
Answer: 58.87cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 9:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 49, 53, 38, 29, 13, 16, 78
Answer: Mean = 41.25, Median = 43.5, Range = 65