Keystones — Capstone
Five GCSE retrieval questions · 26 September 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 12
Answer: 5(x + 1)² + 7 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 29cm, angle = 70°. Give your answer to 2 decimal places
Answer: 258.89cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 16:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 56, 48, 27, 83, 11, 52, 78, 78. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 54, Range = 72