Only 13 percent of schools that participated in a teacher-bonus program last year met their targets after test scores bombed across the board, education officials said as they announced the program has been suspended.

The $4.2 million payout to educators — based on whether their schools met student-performance targets on state math and reading tests or graduation rates — was by far the smallest amount awarded during a three-year pilot program.

It was set up to evaluate whether cash incentives for teachers in high-needs schools can boost student performance.