Keystones — Capstone
Five GCSE retrieval questions · 25 October 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √1000
Answer: 10√10 -
2. Algebra Completing the square
Complete the square: 3x² + 18x - 6
Answer: 3(x + 3)² - 33 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 26cm, b = 12cm, angle = 70°. Give your answer to 2 decimal places
Answer: 146.59cm² -
4. Ratio Combining two ratios
a:b is 9:2 and b:c is 3:2. Find a:b:c in its simplest form.
Answer: 27:6:4 -
5. Statistics Averages and range
Find the mean, median and range of: 85, 36, 54, 69, 62, 97, 46, 19
Answer: Mean = 58.5, Median = 58, Range = 78