Money is a special case. First the general case. I'm a US native speaker and will use US examples.
Decimal fractions are treated as plural.
0.5 Ω is read as "oh point five ohms."
1.8 mi is read as "one point eight miles."
98.6°F is read as "ninety-eight point six degrees Fahrenheit."
When reading out currency in dollars, we do not read the value as a decimal fraction. We do not use the word "point." And we have a variety of special phrases used for special situations, ranging from informal to slangy.
The straightforward way, which fits all situations, is "X dollars and Y cents." That is, $179.95 is "one hundred seventy-nine dollars and ninety-five cents." Learn this and use it when speaking yourself.
Amounts between $1.21 and $1.99 are often read as "a dollar twenty-one" through "a dollar ninety-nine."
When talking about finance and the unit is not dollars, but millions or billions of dollars, we use the regular language, using the word "point." "$1.83 million" is read as "one point eight three million dollars."