Solutions by everydaycalculation.com
This multiplication involving fractions can also be rephrased as "What is 21/25 of 1/63?"
2125 × 163 is 175.
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Related: 42/25×1/63 21/25×2/63 21/50×1/63 63/25×1/63 21/25×3/63 21/75×1/63 21/25×5/63 21/25×7/63
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