It can be any number that you want. A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. Thus
-7 is a decimal number and 1 - (-7) = 82.3 is a decimal number and 1 - 2.3 = -1.3
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2 - 1/5 is the same as (10/5) - 1/5 so it is 9/5 or 1 and 4/5 (1.8 as a decimal)
1 whole and 1 8th
It is: 1.005-0.005 = 1
The difference is that all whole numbers are decimal numbers, but not all decimal numbers are whole numbers. For example a whole number such as 1 is a decimal number but a decimal number such as 1.5 is not a whole number.
It is: 1-26 = -25