This can be done with how you read decimals in place value (tenths, hundredths, thousandths, and so forth).
Our number is -0.88, which has 8 in the tens and hundredths place, or, 88 hundredths.
Write the hundredths part as the denominator, the first part as your numerator.
= -88 / 100
That satisfies the definition of a rational number, because both -88 and 100 are integers and we have a ratio between them. Further, we are not dividing by zero.
