Keystones — Capstone
Five GCSE retrieval questions · 13 October 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √525
Answer: 5√21 -
2. Algebra Completing the square
Complete the square: x² - x - 1
Answer: (x - 1⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 14cm, b = 23cm, angle = 70°. Give your answer to 2 decimal places
Answer: 151.29cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 14:18:3 -
5. Statistics Averages and range
Find the mean, median and range of: 28, 19, 27, 23, 85, 94, 20. Give your answer to 2 decimal places
Answer: Mean = 42.29, Median = 27, Range = 75