Keystones — Capstone
Five GCSE retrieval questions · 5 October 2015 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 2x² - 16x + 7
Answer: 2(x - 4)² - 25 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 20cm, angle = 54°. Give your answer to 2 decimal places
Answer: 218.43cm² -
4. Ratio Combining two ratios
a:b is 3:2 and b:c is 3:5. Find a:b:c in its simplest form.
Answer: 9:6:10 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 74, 89, 82, 89, 47, 66, 76
Answer: Mean = 75.25, Median = 77.5, Range = 42