Keystones — Capstone
Five GCSE retrieval questions · 12 May 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √125
Answer: 5√5 -
2. Algebra Completing the square
Complete the square: x² + 3x + 1
Answer: (x + 3⁄2)² - 5⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 15cm, b = 28cm, angle = 41°. Give your answer to 2 decimal places
Answer: 137.77cm² -
4. Ratio Combining two ratios
a:b is 8:7 and b:c is 4:9. Find a:b:c in its simplest form.
Answer: 32:28:63 -
5. Statistics Averages and range
Find the mean, median and range of: 79, 45, 10, 96, 68, 19, 45, 82
Answer: Mean = 55.5, Median = 56.5, Range = 86