Keystones — Capstone
Five GCSE retrieval questions · 3 December 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √320
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 4
Answer: 3(x - 1)² - 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 12cm, angle = 61°. Give your answer to 2 decimal places
Answer: 78.72cm² -
4. Ratio Combining two ratios
a:b is 1:2 and b:c is 7:2. Find a:b:c in its simplest form.
Answer: 7:14:4 -
5. Statistics Averages and range
Find the mean, median and range of: 61, 64, 45, 91, 49, 88, 89, 52, 15. Give your answer to 2 decimal places
Answer: Mean = 61.56, Median = 61, Range = 76