Solutions by everydaycalculation.com
1st number: 21 0/4, 2nd number: 12/15
This multiplication involving fractions can also be rephrased as "What is 84/4 of 12/15?"
844 × 1215 is 845.
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Related: 84/4×24/15 84/8×12/15 84/4×12/30 84/4×36/15 84/12×12/15 84/4×12/45 84/4×60/15 84/20×12/15 84/4×12/75 84/4×84/15 84/28×12/15
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