2 1/10.
A mixed number is one that combines integer numbers and fractions, the latter being applicable to the decimal part of that number.
Thus, a number whose value is not an integer can be expressed with decimals or fractions.
Therefore, 2.1 implies an integer 2 and decimals times 0.10. Thus, since 0.1 is equal to 1/10, 2.1 is equal to 2 1/10 as a mixed number.
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