Keystones — Capstone
Five GCSE retrieval questions · 5 April 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 4x² - 32x - 5
Answer: 4(x - 4)² - 69 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 68°. Give your answer to 2 decimal places
Answer: 243.39cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:8. Find a:b:c in its simplest form.
Answer: 63:35:40 -
5. Statistics Averages and range
Find the mean, median and range of: 96, 89, 78, 53, 46, 45, 13, 49. Give your answer to 2 decimal places
Answer: Mean = 58.63, Median = 51, Range = 83