Keystones — Capstone
Five GCSE retrieval questions · 21 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √396
Answer: 6√11 -
2. Algebra Completing the square
Complete the square: 5x² + 30x + 5
Answer: 5(x + 3)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 17cm, angle = 54°. Give your answer to 2 decimal places
Answer: 144.41cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 16:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 68, 29, 69, 44, 45, 43, 43, 58, 38. Give your answer to 2 decimal places
Answer: Mean = 48.56, Median = 44, Range = 40