Keystones — Capstone
Five GCSE retrieval questions · 22 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √300
Answer: 10√3 -
2. Algebra Completing the square
Complete the square: 2x² - 4x - 15
Answer: 2(x - 1)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 66°. Give your answer to 2 decimal places
Answer: 342.58cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 28:21:6 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 81, 99, 39, 65, 67, 93, 83, 42. Give your answer to 2 decimal places
Answer: Mean = 70.78, Median = 68, Range = 60