Keystones — Capstone
Five GCSE retrieval questions · 3 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√27
Answer: 6√3 -
2. Algebra Completing the square
Complete the square: 4x² - 48x + 9
Answer: 4(x - 6)² - 135 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 26cm, angle = 76°. Give your answer to 2 decimal places
Answer: 214.44cm² -
4. Ratio Combining two ratios
a:b is 5:3 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 10:6:15 -
5. Statistics Averages and range
Find the mean, median and range of: 54, 59, 46, 41, 10, 16, 67, 39
Answer: Mean = 41.5, Median = 43.5, Range = 57