Keystones — Capstone
Five GCSE retrieval questions · 25 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 9
Answer: 5(x + 1)² + 4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 20cm, angle = 45°. Give your answer to 2 decimal places
Answer: 113.14cm² -
4. Ratio Combining two ratios
a:b is 6:5 and b:c is 4:3. Find a:b:c in its simplest form.
Answer: 24:20:15 -
5. Statistics Averages and range
Find the mean, median and range of: 83, 86, 14, 31, 31, 81, 46, 93. Give your answer to 2 decimal places
Answer: Mean = 58.13, Median = 63.5, Range = 79