Keystones — Capstone
Five GCSE retrieval questions · 15 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√75
Answer: 20√3 -
2. Algebra Completing the square
Complete the square: 3x² + 6x + 11
Answer: 3(x + 1)² + 8 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 27cm, angle = 50°. Give your answer to 2 decimal places
Answer: 268.88cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 6:5. Find a:b:c in its simplest form.
Answer: 15:12:10 -
5. Statistics Averages and range
Find the mean, median and range of: 80, 29, 26, 100, 68, 63, 98, 83, 21. Give your answer to 2 decimal places
Answer: Mean = 63.11, Median = 68, Range = 79