Keystones — Capstone
Five GCSE retrieval questions · 8 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √288
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: 2x² + 16x + 15
Answer: 2(x + 4)² - 17 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 15cm, angle = 47°. Give your answer to 2 decimal places
Answer: 104.22cm² -
4. Ratio Combining two ratios
a:b is 7:9 and b:c is 8:3. Find a:b:c in its simplest form.
Answer: 56:72:27 -
5. Statistics Averages and range
Find the mean, median and range of: 97, 65, 27, 49, 20, 84, 28, 27. Give your answer to 2 decimal places
Answer: Mean = 49.63, Median = 38.5, Range = 77