Solutions by everydaycalculation.com
The simplest form of 15212421 is 169269.
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Equivalent fractions: 3042/4842 4563/7263 507/807
More fractions: 3042/2421 1521/4842 4563/2421 1521/7263 1522/2421 1521/24221520/2421 1521/2420
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