Keystones — Capstone
Five GCSE retrieval questions · 14 August 2014 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 8
Answer: 5(x - 6)² - 188 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 16cm, angle = 70°. Give your answer to 2 decimal places
Answer: 150.35cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 8:9. Find a:b:c in its simplest form.
Answer: 32:24:27 -
5. Statistics Averages and range
Find the mean, median and range of: 75, 81, 62, 70, 81, 40, 98. Give your answer to 2 decimal places
Answer: Mean = 72.43, Median = 75, Range = 58