Keystones — Capstone
Five GCSE retrieval questions · 18 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: 5x² + 60x - 15
Answer: 5(x + 6)² - 195 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 13cm, angle = 70°. Give your answer to 2 decimal places
Answer: 164.92cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 5:4. Find a:b:c in its simplest form.
Answer: 45:10:8 -
5. Statistics Averages and range
Find the mean, median and range of: 90, 17, 13, 88, 16, 24, 95
Answer: Mean = 49, Median = 24, Range = 82