The number 1120 is already in decimal form. In the number system we use daily, known as the decimal system, numbers are represented in base 10, which includes the digits 0 through 9.
Decimal numbers can be whole numbers or can include fractions (decimals) such as 1120.0, 1120.00, etc. In this case, since 1120 is a whole number, there are actually no additional digits after the decimal point, but it can still be written as 1120.0 to specify its decimal nature.
Therefore, if you’re asking about the representation of 1120 in decimal format, it remains 1120.