Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 18/21 of 15/18?"
1821 × 1518 is 57.
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Related: 36/21×15/18 18/21×30/18 18/42×15/18 18/21×15/36 54/21×15/18 18/21×45/18 18/63×15/18 18/21×15/54 90/21×15/18 18/21×75/18 18/21×15/90
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