Keystones — Capstone
Five GCSE retrieval questions · 22 February 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √272
Answer: 4√17 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 1
Answer: 2(x + 4)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 16cm, angle = 42°. Give your answer to 2 decimal places
Answer: 144.53cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 16:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 69, 18, 11, 69, 76, 24, 86, 59. Give your answer to 2 decimal places
Answer: Mean = 48.89, Median = 59, Range = 75