Keystones — Capstone
Five GCSE retrieval questions · 19 November 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 2√275
Answer: 10√11 -
2. Algebra Completing the square
Complete the square: x² - 7x + 5
Answer: (x - 7⁄2)² - 29⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 30cm, b = 16cm, angle = 49°. Give your answer to 2 decimal places
Answer: 181.13cm² -
4. Ratio Combining two ratios
a:b is 3:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 24:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 21, 10, 100, 24, 70, 14, 36, 17, 41
Answer: Mean = 37, Median = 24, Range = 90