Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 1/3 of 3/9?"
13 × 39 is 19.
Related: 2/3×3/9 1/3×6/9 1/6×3/9 1/3×3/18 1/9×3/9 1/3×3/27 5/3×3/9 1/3×15/9 1/15×3/9 1/3×3/45 7/3×3/9 1/3×21/9 1/21×3/9 1/3×3/63
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