Keystones — Capstone
Five GCSE retrieval questions · 13 April 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√8
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 1
Answer: 3(x + 3)² - 28 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 29cm, angle = 65°. Give your answer to 2 decimal places
Answer: 275.97cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 4:7. Find a:b:c in its simplest form.
Answer: 16:20:35 -
5. Statistics Averages and range
Find the mean, median and range of: 31, 100, 63, 91, 50, 94, 25. Give your answer to 2 decimal places
Answer: Mean = 64.86, Median = 63, Range = 75