Keystones — Capstone
Five GCSE retrieval questions · 8 October 2010 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: √486
Answer: 9√6 -
2. Algebra Completing the square
Complete the square: 3x² - 18x - 11
Answer: 3(x - 3)² - 38 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 27cm, b = 29cm, angle = 48°. Give your answer to 2 decimal places
Answer: 290.94cm² -
4. Ratio Combining two ratios
a:b is 8:5 and b:c is 7:6. Find a:b:c in its simplest form.
Answer: 56:35:30 -
5. Statistics Averages and range
Find the mean, median and range of: 26, 53, 35, 97, 93, 51, 17. Give your answer to 2 decimal places
Answer: Mean = 53.14, Median = 51, Range = 80