Keystones — Capstone
Five GCSE retrieval questions · 1 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √352
Answer: 4√22 -
2. Algebra Completing the square
Complete the square: 3x² + 12x + 2
Answer: 3(x + 2)² - 10 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 24cm, b = 22cm, angle = 40°. Give your answer to 2 decimal places
Answer: 169.7cm² -
4. Ratio Combining two ratios
a:b is 2:3 and b:c is 4:5. Find a:b:c in its simplest form.
Answer: 8:12:15 -
5. Statistics Averages and range
Find the mean, median and range of: 100, 35, 44, 44, 76, 50, 14, 36. Give your answer to 2 decimal places
Answer: Mean = 49.88, Median = 44, Range = 86