Keystones — Capstone
Five GCSE retrieval questions · 15 January 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√20
Answer: 8√5 -
2. Algebra Completing the square
Complete the square: x² - 3x + 4
Answer: (x - 3⁄2)² + 7⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 26cm, angle = 47°. Give your answer to 2 decimal places
Answer: 142.61cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 6:1. Find a:b:c in its simplest form.
Answer: 24:42:7 -
5. Statistics Averages and range
Find the mean, median and range of: 55, 26, 18, 59, 72, 29, 97. Give your answer to 2 decimal places
Answer: Mean = 50.86, Median = 55, Range = 79