Keystones — Capstone
Five GCSE retrieval questions · 7 April 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: 5x² + 40x
Answer: 5(x + 4)² - 80 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 30cm, angle = 66°. Give your answer to 2 decimal places
Answer: 232.95cm² -
4. Ratio Combining two ratios
a:b is 3:8 and b:c is 9:1. Find a:b:c in its simplest form.
Answer: 27:72:8 -
5. Statistics Averages and range
Find the mean, median and range of: 70, 24, 55, 90, 36, 36, 84. Give your answer to 2 decimal places
Answer: Mean = 56.43, Median = 55, Range = 66