Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/25 of 20/21?"
2125 × 2021 is 45.
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Related: 42/25×20/21 21/25×40/21 21/50×20/21 21/25×20/42 63/25×20/21 21/25×60/21 21/75×20/21 21/25×20/63
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