Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 1/3 of 5/7?"
13 × 57 is 521.
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Related: 2/3×5/7 1/3×10/7 1/6×5/7 1/3×5/14 1/3×15/7 1/9×5/7 1/3×5/21 5/3×5/7 1/3×25/7 1/15×5/7 1/3×5/35 7/3×5/7 1/3×35/7 1/21×5/7 1/3×5/49
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