Keystones — Capstone
Five GCSE retrieval questions · 20 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √425
Answer: 5√17 -
2. Algebra Completing the square
Complete the square: 4x² + 24x + 13
Answer: 4(x + 3)² - 23 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 23cm, angle = 63°. Give your answer to 2 decimal places
Answer: 215.18cm² -
4. Ratio Combining two ratios
a:b is 8:3 and b:c is 5:9. Find a:b:c in its simplest form.
Answer: 40:15:27 -
5. Statistics Averages and range
Find the mean, median and range of: 36, 10, 35, 96, 23, 17, 40, 62. Give your answer to 2 decimal places
Answer: Mean = 39.88, Median = 35.5, Range = 86