Keystones — Capstone
Five GCSE retrieval questions · 16 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √847
Answer: 11√7 -
2. Algebra Completing the square
Complete the square: 4x² - 16x - 4
Answer: 4(x - 2)² - 20 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 69°. Give your answer to 2 decimal places
Answer: 257.2cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:1. Find a:b:c in its simplest form.
Answer: 27:6:2 -
5. Statistics Averages and range
Find the mean, median and range of: 91, 27, 34, 98, 35, 10, 63, 65, 71. Give your answer to 2 decimal places
Answer: Mean = 54.89, Median = 63, Range = 88