Keystones — Capstone
Five GCSE retrieval questions · 2 December 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √832
Answer: 8√13 -
2. Algebra Completing the square
Complete the square: x² - 7x - 1
Answer: (x - 7⁄2)² - 53⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 17cm, b = 16cm, angle = 70°. Give your answer to 2 decimal places
Answer: 127.8cm² -
4. Ratio Combining two ratios
a:b is 8:9 and b:c is 5:8. Find a:b:c in its simplest form.
Answer: 40:45:72 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 55, 33, 98, 23, 10, 37, 62. Give your answer to 2 decimal places
Answer: Mean = 44.13, Median = 36, Range = 88