Keystones — Capstone
Five GCSE retrieval questions · 23 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√54
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 5x² - 60x - 14
Answer: 5(x - 6)² - 194 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 22cm, angle = 73°. Give your answer to 2 decimal places
Answer: 220.91cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 2:9. Find a:b:c in its simplest form.
Answer: 18:10:45 -
5. Statistics Averages and range
Find the mean, median and range of: 92, 83, 78, 18, 36, 92, 92, 24, 93. Give your answer to 2 decimal places
Answer: Mean = 67.56, Median = 83, Range = 75