The union representing 30,000 education workers reached a tentative deal with the Los Angeles Unified School District on Friday, following a three-day strike that closed hundreds of campuses and canceled classes for 422,000 students earlier this week.

Local 99 of the Service Employees International Union, which represents support workers in the school district, sought a 30 percent pay increase and said that many of its employees made little more than the minimum wage and struggled to afford the cost of living in Southern California. Both the union and the school district announced the deal late Friday afternoon.

The Los Angeles teachers’ union had asked its 35,000 members to walk out in solidarity and to avoid crossing the support workers’ picket lines.

The strike was limited to three days, and schools already had reopened on Friday morning before Local 99 agreed to a new tentative contract. The union said that Los Angeles Unified, the second-largest school district in the nation, had met its key demands.

The deal must still be voted on by the full union.

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