Keystones — Capstone
Five GCSE retrieval questions · 14 August 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√45
Answer: 12√5 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 3
Answer: 5(x - 6)² - 183 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 28cm, angle = 79°. Give your answer to 2 decimal places
Answer: 412.28cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 3:4. Find a:b:c in its simplest form.
Answer: 18:21:28 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 79, 59, 40, 85, 62, 61, 67
Answer: Mean = 67.25, Median = 64.5, Range = 45