Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/64 of 6/9?"
2164 × 69 is 732.
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Related: 42/64×6/9 21/64×12/9 21/64×6/18 63/64×6/9 21/64×18/9 21/64×6/27 21/64×30/9 21/64×6/45 21/64×42/9 21/64×6/63
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