Keystones — Capstone
Five GCSE retrieval questions · 25 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √960
Answer: 8√15 -
2. Algebra Completing the square
Complete the square: x² - 11x - 1
Answer: (x - 11⁄2)² - 125⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 16cm, b = 21cm, angle = 74°. Give your answer to 2 decimal places
Answer: 161.49cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 9:8. Find a:b:c in its simplest form.
Answer: 45:36:32 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 66, 56, 28, 88, 83, 47, 15. Give your answer to 2 decimal places
Answer: Mean = 54.13, Median = 53, Range = 73