Keystones — Capstone
Five GCSE retrieval questions · 23 May 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√50
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: 3x² - 24x + 9
Answer: 3(x - 4)² - 39 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 14cm, angle = 42°. Give your answer to 2 decimal places
Answer: 93.68cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 2:5. Find a:b:c in its simplest form.
Answer: 4:18:45 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 56, 40, 26, 13, 58, 23, 87
Answer: Mean = 43.25, Median = 41.5, Range = 74