Keystones — Capstone
Five GCSE retrieval questions · 9 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√50
Answer: 10√2 -
2. Algebra Completing the square
Complete the square: x² + 3x - 10
Answer: (x + 3⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 13cm, b = 25cm, angle = 52°. Give your answer to 2 decimal places
Answer: 128.05cm² -
4. Ratio Combining two ratios
a:b is 3:4 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 9:12:14 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 16, 43, 25, 68, 34, 55, 98, 23. Give your answer to 2 decimal places
Answer: Mean = 42.56, Median = 34, Range = 82