What were the three largest expenditures in the federal budget in 2012? Together, how much of the budget did they make up? How much money was that?

Medicare and Medicaid, Social Security, and Defense were the three major expenditure for the 2012 budget of the United States.

The three expenditure made up just a little more than 60 percent of the budget.

The total cost for the three expenditure was about 2.4 trillion dollars.