Keystones — Capstone
Five GCSE retrieval questions · 5 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √891
Answer: 9√11 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 9
Answer: 2(x - 6)² - 63 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 21cm, angle = 80°. Give your answer to 2 decimal places
Answer: 124.09cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 21:14:16 -
5. Statistics Averages and range
Find the mean, median and range of: 81, 85, 18, 80, 58, 36, 39, 75, 54. Give your answer to 2 decimal places
Answer: Mean = 58.44, Median = 58, Range = 67