425 as a decimal is simply 425.0. This means that 425 is a whole number and can also be expressed in decimal form by adding a decimal point followed by a zero.
To break it down, a decimal number is just a way of representing numbers that are not whole, using a decimal point to separate the whole number part from the fractional part. In this case, since 425 is already a whole number, its decimal form remains 425.0.