Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 7/28 of 21/49?"
728 × 2149 is 328.
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Related: 14/28×21/49 7/28×42/49 7/56×21/49 7/28×21/98 21/28×21/49 7/28×63/49 7/84×21/49 35/28×21/49 49/28×21/49
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