Solutions by everydaycalculation.com
The simplest form of 421728 is 7288.
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Equivalent fractions: 84/3456 21/864 126/5184 14/576 210/8640
More fractions: 84/1728 42/3456 126/1728 42/5184 43/1728 42/172941/1728 42/1727
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