Keystones — Capstone
Five GCSE retrieval questions · 27 December 2011 · 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 + 11x - 5
Answer: (x + 11⁄2)² - 141⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 43°. Give your answer to 2 decimal places
Answer: 163.68cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 40:15:18 -
5. Statistics Averages and range
Find the mean, median and range of: 37, 46, 13, 42, 82, 23, 96, 64, 30. Give your answer to 2 decimal places
Answer: Mean = 48.11, Median = 42, Range = 83