Without properties, you cannot have a number system. Without a number system, there is nothing to add.
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Decimals are fractions. Fractions are easy to picture graphically. Considering them in a concrete fashion makes the basic operations of addition and subtraction easy to visualize.
The improper fraction will turn out to be some whole number plus a fraction. That will locate the number between that whole number (without the fraction) and the one following it. 22/7 = 3 and 1/7 and lies between 3 and 4.
To express 121 as a decimal, you simply write it as 121.0. This is because whole numbers can be represented as decimals by adding a decimal point and a zero after them. In this case, 121 remains the same when converted to a decimal form.
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