Keystones — Capstone
Five GCSE retrieval questions · 15 April 2013 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √475
Answer: 5√19 -
2. Algebra Completing the square
Complete the square: x² + 3x - 7
Answer: (x + 3⁄2)² - 37⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 23cm, b = 17cm, angle = 62°. Give your answer to 2 decimal places
Answer: 172.62cm² -
4. Ratio Combining two ratios
a:b is 2:5 and b:c is 6:7. Find a:b:c in its simplest form.
Answer: 12:30:35 -
5. Statistics Averages and range
Find the mean, median and range of: 43, 71, 78, 82, 88, 21, 89. Give your answer to 2 decimal places
Answer: Mean = 67.43, Median = 78, Range = 68