Keystones — Capstone
Five GCSE retrieval questions · 1 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: 4x² + 32x + 10
Answer: 4(x + 4)² - 54 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 25cm, angle = 48°. Give your answer to 2 decimal places
Answer: 241.52cm² -
4. Ratio Combining two ratios
a:b is 5:2 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 25:10:6 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 87, 43, 92, 18, 50, 61, 15, 36. Give your answer to 2 decimal places
Answer: Mean = 48.11, Median = 43, Range = 77