Keystones — Capstone
Five GCSE retrieval questions · 15 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √931
Answer: 7√19 -
2. Algebra Completing the square
Complete the square: x² + 3x
Answer: (x + 3⁄2)² - 9⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 26cm, angle = 62°. Give your answer to 2 decimal places
Answer: 241.04cm² -
4. Ratio Combining two ratios
a:b is 7:8 and b:c is 5:1. Find a:b:c in its simplest form.
Answer: 35:40:8 -
5. Statistics Averages and range
Find the mean, median and range of: 46, 44, 89, 19, 78, 28, 98. Give your answer to 2 decimal places
Answer: Mean = 57.43, Median = 46, Range = 79