Just write them next to each other.
3 + 0.75 = 3.75
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The only decimals that are integers are ones such as 4.00000 or -5.00 or 100.0. If there is anything other than 0 after the decimal place it is NOT an integer. So to add them, just add the numbers to the left of the decimal place.
No, if it has a decimal place then its not an integer
an integer won't have any decimal point
You do not need to do anything. But if you must you can add a decimal point after it. You should not add any 0s after the decimal point because that implies a higher degree of precision. So the decimal for 37 is 37 or 37. but not 37.0 (which implies accuracy to a tenth of a unit).
An integer is a number that has no decimal. Yes, 184 is an integer.