Keystones — Capstone
Five GCSE retrieval questions · 1 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√24
Answer: 8√6 -
2. Algebra Completing the square
Complete the square: 2x² - 20x - 7
Answer: 2(x - 5)² - 57 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 17cm, angle = 74°. Give your answer to 2 decimal places
Answer: 155.24cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 14:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 80, 70, 92, 67, 41, 18, 25, 17. Give your answer to 2 decimal places
Answer: Mean = 49.44, Median = 41, Range = 75