Keystones — Capstone
Five GCSE retrieval questions · 14 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√99
Answer: 15√11 -
2. Algebra Completing the square
Complete the square: 3x² - 12x + 3
Answer: 3(x - 2)² - 9 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 21cm, angle = 49°. Give your answer to 2 decimal places
Answer: 198.11cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 7:21:18 -
5. Statistics Averages and range
Find the mean, median and range of: 69, 43, 23, 36, 21, 18, 20. Give your answer to 2 decimal places
Answer: Mean = 32.86, Median = 23, Range = 51