Keystones — Capstone
Five GCSE retrieval questions · 12 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √336
Answer: 4√21 -
2. Algebra Completing the square
Complete the square: x² - 3x + 3
Answer: (x - 3⁄2)² + 3⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 19cm, angle = 65°. Give your answer to 2 decimal places
Answer: 154.98cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 32:56:7 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 50, 65, 35, 33, 19, 49. Give your answer to 2 decimal places
Answer: Mean = 49.57, Median = 49, Range = 77