Keystones — Capstone
Five GCSE retrieval questions · 27 July 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√112
Answer: 8√7 -
2. Algebra Completing the square
Complete the square: x² + 9x + 8
Answer: (x + 9⁄2)² - 49⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 15cm, angle = 69°. Give your answer to 2 decimal places
Answer: 154.04cm² -
4. Ratio Combining two ratios
a:b is 4:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 28:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 30, 40, 20, 23, 43, 64, 53, 13, 40. Give your answer to 2 decimal places
Answer: Mean = 36.22, Median = 40, Range = 51