Keystones — Capstone
Five GCSE retrieval questions · 12 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√50
Answer: 20√2 -
2. Algebra Completing the square
Complete the square: 2x² + 24x + 4
Answer: 2(x + 6)² - 68 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 18cm, angle = 71°. Give your answer to 2 decimal places
Answer: 102.12cm² -
4. Ratio Combining two ratios
a:b is 1:8 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 3:24:64 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 15, 71, 57, 89, 96, 67, 75. Give your answer to 2 decimal places
Answer: Mean = 69.38, Median = 73, Range = 81