Keystones — Capstone
Five GCSE retrieval questions · 31 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √490
Answer: 7√10 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 2
Answer: 4(x - 4)² - 66 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 71°. Give your answer to 2 decimal places
Answer: 241.11cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 10:45:27 -
5. Statistics Averages and range
Find the mean, median and range of: 53, 16, 80, 68, 98, 79, 50. Give your answer to 2 decimal places
Answer: Mean = 63.43, Median = 68, Range = 82