Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 2/10 of 4/10?"
210 × 410 is 225.
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Related: 4/10×4/10 2/10×8/10 2/20×4/10 2/10×4/20 6/10×4/10 2/10×12/10 2/30×4/10 2/10×4/30 2/10×20/10 2/50×4/10 2/10×4/50 14/10×4/10 2/10×28/10 2/70×4/10 2/10×4/70
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