Keystones — Capstone
Five GCSE retrieval questions · 6 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√40
Answer: 4√10 -
2. Algebra Completing the square
Complete the square: 3x² - 30x - 1
Answer: 3(x - 5)² - 76 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 15cm, angle = 53°. Give your answer to 2 decimal places
Answer: 149.74cm² -
4. Ratio Combining two ratios
a:b is 2:7 and b:c is 9:4. Find a:b:c in its simplest form.
Answer: 18:63:28 -
5. Statistics Averages and range
Find the mean, median and range of: 59, 28, 61, 93, 95, 77, 58, 50, 65. Give your answer to 2 decimal places
Answer: Mean = 65.11, Median = 61, Range = 67