The answer will depend on 2 months as a fraction of what!
0.16666 repeating year
1/2 year
9 months of a year as a decimal is 0.75
It is 10 months. There is no need for a decimal point, and trailing 0s are misleading.
15 months = 1.25 years
9 months is 9/12 of a year and in decimal form it is 0.75
It is not even but 2 months is .1667 of a year
1/2 year
It is simply 17.0 months as a decimal
9 months of a year as a decimal is 0.75
18 months into two years would be expressed a 3/4 of two years.
It is 10 months. There is no need for a decimal point, and trailing 0s are misleading.
Four months is a third of a year which would be expressed as .33 repeating as a decimal.
18 months = 1 and 1/2 years = 1.5 in decimal
15 months = 1.25 years
9 months is 9/12 of a year and in decimal form it is 0.75
4 months, as a decimal, is 4 months. Or, if you prefer, 4.00 months. It does not matter how many 0s you append after the decimal point - except that the greater the number of 0s the greater the implied precision.
0.666667