Keystones — Capstone
Five GCSE retrieval questions · 26 July 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: x² - 9x + 6
Answer: (x - 9⁄2)² - 57⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 17cm, angle = 61°. Give your answer to 2 decimal places
Answer: 193.29cm² -
4. Ratio Combining two ratios
a:b is 1:7 and b:c is 9:2. Find a:b:c in its simplest form.
Answer: 9:63:14 -
5. Statistics Averages and range
Find the mean, median and range of: 57, 10, 13, 43, 81, 86, 83, 76. Give your answer to 2 decimal places
Answer: Mean = 56.13, Median = 66.5, Range = 76