Keystones — Capstone
Five GCSE retrieval questions · 8 November 2012 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √700
Answer: 10√7 -
2. Algebra Completing the square
Complete the square: 2x² + 16x - 8
Answer: 2(x + 4)² - 40 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 20cm, b = 23cm, angle = 79°. Give your answer to 2 decimal places
Answer: 225.77cm² -
4. Ratio Combining two ratios
a:b is 4:7 and b:c is 5:6. Find a:b:c in its simplest form.
Answer: 20:35:42 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 22, 28, 10, 31, 10, 62, 74, 58. Give your answer to 2 decimal places
Answer: Mean = 43.56, Median = 31, Range = 87