Three months is one fourth of a year: 0.25
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To express 2 years and 3 months as a decimal, you need to convert the months into a fraction of a year. Since there are 12 months in a year, 3 months is equal to 3/12 or 0.25 years. Adding this to 2 years gives a total of 2.25 years, which can be expressed as a decimal as 2.25.
You start to answer this question by changing years to months. One year is 12 months, so you want to know what percent of 12 months is 4 months. First ask, what part of 12 months is 4 months? The answer is 4/12. Reduce the fraction to 1/3. Change 1/3 to a decimal .33333333... (the 3s go on forever. To change a decimal to a percent divide by 100 (per means divide by, cent means 100). To divide a decimal by 100 move the decimal sign two steps to the right. so the answer is 33.33333...% or 33 1/3 %.
Four months is a third of a year which would be expressed as .33 repeating as a decimal.
3 years and 11/12 of a year (fraction) 3.91666667 years (decimal)
0.5 years