Keystones — Capstone
Five GCSE retrieval questions · 31 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√80
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 2x² - 20x + 13
Answer: 2(x - 5)² - 37 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 14cm, angle = 43°. Give your answer to 2 decimal places
Answer: 85.93cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 12:21:7 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 54, 14, 53, 64, 37, 39. Give your answer to 2 decimal places
Answer: Mean = 42.29, Median = 39, Range = 50