Keystones — Capstone
Five GCSE retrieval questions · 17 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √500
Answer: 10√5 -
2. Algebra Completing the square
Complete the square: 2x² - 24x + 6
Answer: 2(x - 6)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 14cm, angle = 79°. Give your answer to 2 decimal places
Answer: 206.14cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 35:14:12 -
5. Statistics Averages and range
Find the mean, median and range of: 45, 61, 78, 24, 70, 10, 20
Answer: Mean = 44, Median = 45, Range = 68