Keystones — Capstone
Five GCSE retrieval questions · 24 August 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √600
Answer: 10√6 -
2. Algebra Completing the square
Complete the square: x² + x + 3
Answer: (x + 1⁄2)² + 11⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 18cm, b = 22cm, angle = 80°. Give your answer to 2 decimal places
Answer: 194.99cm² -
4. Ratio Combining two ratios
a:b is 1:5 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 4:20:45 -
5. Statistics Averages and range
Find the mean, median and range of: 42, 26, 34, 97, 14, 89, 74, 92
Answer: Mean = 58.5, Median = 58, Range = 83