Keystones — Capstone
Five GCSE retrieval questions · 9 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 11
Answer: 3(x + 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 13cm, angle = 72°. Give your answer to 2 decimal places
Answer: 179.27cm² -
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: 21, 76, 62, 30, 38, 35, 95, 19
Answer: Mean = 47, Median = 36.5, Range = 76