The debate triggered by a $34 million math mistake critical to the survival of a proposed D.C. teachers contract became more complicated Thursday by the revelation of at least two other major budgeting blunders.

D.C. Public Schools does have a surplus of more than $34 million for school operations, said a letter from Chief Financial Officer Natwar Gandhi to Chancellor Michelle Rhee. But it also has a roughly $20 million deficit in central office operations, and a nearly $10 million deficit for overtime and special pay.