Keystones — Capstone
Five GCSE retrieval questions · 16 June 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √637
Answer: 7√13 -
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 = 14cm, b = 13cm, angle = 63°. Give your answer to 2 decimal places
Answer: 81.08cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 29, 18, 20, 49, 31, 68, 25. Give your answer to 2 decimal places
Answer: Mean = 37.13, Median = 30, Range = 50