Keystones — Capstone
Five GCSE retrieval questions · 26 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √162
Answer: 9√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 9
Answer: 2(x + 4)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 12cm, angle = 53°. Give your answer to 2 decimal places
Answer: 81.46cm² -
4. Ratio Combining two ratios
a:b is 5:6 and b:c is 8:1. Find a:b:c in its simplest form.
Answer: 20:24:3 -
5. Statistics Averages and range
Find the mean, median and range of: 39, 16, 44, 57, 36, 37, 89, 41, 88. Give your answer to 2 decimal places
Answer: Mean = 49.67, Median = 41, Range = 73