Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 18/36 of 4/18?"
1836 × 418 is 19.
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Related: 18/36×8/18 18/72×4/18 18/36×4/36 54/36×4/18 18/36×12/18 18/36×4/54 90/36×4/18 18/36×20/18 18/36×4/90 18/36×28/18
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