Keystones — Capstone
Five GCSE retrieval questions · 1 November 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√50
Answer: 10√2 -
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 = 18cm, b = 13cm, angle = 80°. Give your answer to 2 decimal places
Answer: 115.22cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:7. Find a:b:c in its simplest form.
Answer: 40:15:21 -
5. Statistics Averages and range
Find the mean, median and range of: 82, 16, 42, 38, 83, 65, 68. Give your answer to 2 decimal places
Answer: Mean = 56.29, Median = 65, Range = 67