Keystones — Capstone
Five GCSE retrieval questions · 11 January 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√44
Answer: 8√11 -
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 = 13cm, b = 21cm, angle = 71°. Give your answer to 2 decimal places
Answer: 129.06cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 36:42:35 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 32, 18, 45, 12, 31, 53, 76, 12. Give your answer to 2 decimal places
Answer: Mean = 35.78, Median = 32, Range = 64