Keystones — Capstone
Five GCSE retrieval questions · 2 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √405
Answer: 9√5 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 4
Answer: 3(x - 5)² - 79 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 19cm, angle = 76°. Give your answer to 2 decimal places
Answer: 276.53cm² -
4. Ratio Combining two ratios
a:b is 7:4 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:20:4 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 89, 59, 26, 10, 30, 29. Give your answer to 2 decimal places
Answer: Mean = 44.43, Median = 30, Range = 79