Keystones — Capstone
Five GCSE retrieval questions · 9 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √128
Answer: 8√2 -
2. Algebra Completing the square
Complete the square: 4x² + 8x - 7
Answer: 4(x + 1)² - 11 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 28cm, b = 12cm, angle = 71°. Give your answer to 2 decimal places
Answer: 158.85cm² -
4. Ratio Combining two ratios
a:b is 9:5 and b:c is 7:4. Find a:b:c in its simplest form.
Answer: 63:35:20 -
5. Statistics Averages and range
Find the mean, median and range of: 35, 54, 44, 10, 22, 69, 51, 80, 79. Give your answer to 2 decimal places
Answer: Mean = 49.33, Median = 51, Range = 70