Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 7/9 of 40/70?"
79 × 4070 is 49.
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Related: 14/9×40/70 7/9×80/70 7/18×40/70 21/9×40/70 7/27×40/70 35/9×40/70 7/45×40/70 49/9×40/70 7/63×40/70
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