2.1
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One and two tenths because the 1 is the whole, the point is called and , the 2 is the fraction that is in the tenth place.
2.1 has one-tenth. The number 2 before the decimal point represents two whole units, and the digit 1 after the decimal point represents one-tenth. In decimal notation, each place value after the decimal point represents a power of 10, with the first place after the decimal point representing tenths.
2.9
3.14159265353.1415926535
5/10 = 1/2, or 0.5.