Keystones — Capstone
Five GCSE retrieval questions · 29 December 2011 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √192
Answer: 8√3 -
2. Algebra Completing the square
Complete the square: x² + 11x + 10
Answer: (x + 11⁄2)² - 81⁄4 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 19cm, b = 21cm, angle = 55°. Give your answer to 2 decimal places
Answer: 163.42cm² -
4. Ratio Combining two ratios
a:b is 9:8 and b:c is 3:7. Find a:b:c in its simplest form.
Answer: 27:24:56 -
5. Statistics Averages and range
Find the mean, median and range of: 94, 12, 94, 38, 65, 14, 95. Give your answer to 2 decimal places
Answer: Mean = 58.86, Median = 65, Range = 83