Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/36 of 6/9?"
2136 × 69 is 718.
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Related: 42/36×6/9 21/36×12/9 21/72×6/9 21/36×6/18 63/36×6/9 21/36×18/9 21/36×6/27 21/36×30/9 21/36×6/45 21/36×42/9 21/36×6/63
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