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