Keystones — Capstone
Five GCSE retrieval questions · 29 October 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: x² - x + 5
Answer: (x - 1⁄2)² + 19⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 25cm, angle = 52°. Give your answer to 2 decimal places
Answer: 295.5cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 4:12:27 -
5. Statistics Averages and range
Find the mean, median and range of: 13, 99, 18, 44, 52, 14, 22. Give your answer to 2 decimal places
Answer: Mean = 37.43, Median = 22, Range = 86