Keystones — Capstone
Five GCSE retrieval questions · 31 July 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √147
Answer: 7√3 -
2. Algebra Completing the square
Complete the square: x² - 11x + 8
Answer: (x - 11⁄2)² - 89⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 15cm, angle = 40°. Give your answer to 2 decimal places
Answer: 81.96cm² -
4. Ratio Combining two ratios
a:b is 4:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 38, 72, 27, 28, 41, 14, 31, 53, 61. Give your answer to 2 decimal places
Answer: Mean = 40.56, Median = 38, Range = 58