Keystones — Capstone
Five GCSE retrieval questions · 21 August 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √252
Answer: 6√7 -
2. Algebra Completing the square
Complete the square: x² + 3x - 1
Answer: (x + 3⁄2)² - 13⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 22cm, b = 30cm, angle = 57°. Give your answer to 2 decimal places
Answer: 276.76cm² -
4. Ratio Combining two ratios
a:b is 2:9 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 10:45:54 -
5. Statistics Averages and range
Find the mean, median and range of: 10, 38, 10, 24, 29, 77, 82. Give your answer to 2 decimal places
Answer: Mean = 38.57, Median = 29, Range = 72