Keystones — Capstone
Five GCSE retrieval questions · 27 March 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 4x² + 40x - 15
Answer: 4(x + 5)² - 115 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 21cm, angle = 54°. Give your answer to 2 decimal places
Answer: 229.36cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 14:18:21 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 56, 56, 56, 50, 21, 28, 60, 50. Give your answer to 2 decimal places
Answer: Mean = 47.89, Median = 54, Range = 39