: The integers are rational numbers. Don't get bogged down by 'simplest terms', they aren't really important. If it helps you can express 1/1 and 2/1 as the 'simplest terms' (a/b with a and b having no common factors) for 1 and 2, since 1 is not considered a common factor. Think of writing 1 as shorthand for writing 1/1, the denominator is always there you just don't write it.
