Keystones — Capstone
Five GCSE retrieval questions · 24 January 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 4√18
Answer: 12√2 -
2. Algebra Completing the square
Complete the square: x² + 11x - 6
Answer: (x + 11⁄2)² - 145⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 30cm, angle = 51°. Give your answer to 2 decimal places
Answer: 314.74cm² -
4. Ratio Combining two ratios
a:b is 1:3 and b:c is 7:5. Find a:b:c in its simplest form.
Answer: 7:21:15 -
5. Statistics Averages and range
Find the mean, median and range of: 17, 60, 63, 71, 17, 16, 12. Give your answer to 2 decimal places
Answer: Mean = 36.57, Median = 17, Range = 59