Keystones — Capstone
Five GCSE retrieval questions · 5 January 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 + 12
Answer: 4(x + 2)² - 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 29cm, b = 23cm, angle = 51°. Give your answer to 2 decimal places
Answer: 259.18cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 21:15:35 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 36, 12, 94, 83, 98, 53, 57
Answer: Mean = 56.75, Median = 55, Range = 86