Keystones — Capstone
Five GCSE retrieval questions · 29 April 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: 3x² - 6x - 2
Answer: 3(x - 1)² - 5 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 25cm, b = 24cm, angle = 53°. Give your answer to 2 decimal places
Answer: 239.59cm² -
4. Ratio Combining two ratios
a:b is 5:4 and b:c is 3:8. Find a:b:c in its simplest form.
Answer: 15:12:32 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 17, 67, 28, 50, 37, 46. Give your answer to 2 decimal places
Answer: Mean = 42.14, Median = 46, Range = 50