Keystones — Capstone
Five GCSE retrieval questions · 3 June 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √833
Answer: 7√17 -
2. Algebra Completing the square
Complete the square: 3x² + 30x + 2
Answer: 3(x + 5)² - 73 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 14cm, angle = 45°. Give your answer to 2 decimal places
Answer: 128.69cm² -
4. Ratio Combining two ratios
a:b is 4:9 and b:c is 7:3. Find a:b:c in its simplest form.
Answer: 28:63:27 -
5. Statistics Averages and range
Find the mean, median and range of: 19, 97, 68, 70, 29, 38, 18, 44. Give your answer to 2 decimal places
Answer: Mean = 47.88, Median = 41, Range = 79