Keystones — Capstone
Five GCSE retrieval questions · 5 September 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √96
Answer: 4√6 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 14
Answer: 3(x + 3)² - 41 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 22cm, angle = 66°. Give your answer to 2 decimal places
Answer: 170.83cm² -
4. Ratio Combining two ratios
a:b is 6:7 and b:c is 5:3. Find a:b:c in its simplest form.
Answer: 30:35:21 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 53, 35, 46, 77, 20, 47. Give your answer to 2 decimal places
Answer: Mean = 43.71, Median = 46, Range = 57