Keystones — Capstone
Five GCSE retrieval questions · 8 November 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 3√125
Answer: 15√5 -
2. Algebra Completing the square
Complete the square: 4x² - 16x + 2
Answer: 4(x - 2)² - 14 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 21cm, angle = 49°. Give your answer to 2 decimal places
Answer: 206.04cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 16:40:15 -
5. Statistics Averages and range
Find the mean, median and range of: 24, 27, 25, 25, 92, 79, 76. Give your answer to 2 decimal places
Answer: Mean = 49.71, Median = 27, Range = 68