Keystones — Capstone
Five GCSE retrieval questions · 7 January 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √726
Answer: 11√6 -
2. Algebra Completing the square
Complete the square: 3x² + 30x - 1
Answer: 3(x + 5)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 20cm, angle = 66°. Give your answer to 2 decimal places
Answer: 173.57cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 15:20:16 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 91, 42, 43, 17, 20, 11. Give your answer to 2 decimal places
Answer: Mean = 39.57, Median = 42, Range = 80