Keystones — Capstone
Five GCSE retrieval questions · 3 June 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √48
Answer: 4√3 -
2. Algebra Completing the square
Complete the square: x² + 7x + 1
Answer: (x + 7⁄2)² - 45⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 20cm, angle = 69°. Give your answer to 2 decimal places
Answer: 242.73cm² -
4. Ratio Combining two ratios
a:b is 1:4 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 7:28:16 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 11, 80, 93, 60, 92, 28, 46, 28. Give your answer to 2 decimal places
Answer: Mean = 53.44, Median = 46, Range = 82