Keystones — Capstone
Five GCSE retrieval questions · 4 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √612
Answer: 6√17 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 3
Answer: 3(x - 1)² - 6 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 12cm, b = 30cm, angle = 62°. Give your answer to 2 decimal places
Answer: 158.93cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:36:32 -
5. Statistics Averages and range
Find the mean, median and range of: 47, 25, 48, 26, 73, 48, 93. Give your answer to 2 decimal places
Answer: Mean = 51.43, Median = 48, Range = 68