Keystones — Capstone
Five GCSE retrieval questions · 17 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √810
Answer: 9√10 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 15
Answer: 5(x + 1)² + 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 22cm, angle = 46°. Give your answer to 2 decimal places
Answer: 150.34cm² -
4. Ratio Combining two ratios
a:b is 9:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 54:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 65, 54, 51, 80, 60, 86. Give your answer to 2 decimal places
Answer: Mean = 61.86, Median = 60, Range = 49