Small businesses gradually are picking up the pace of their hiring, according to reports this week.

The payroll company ADP said last week that its small-business customers added 58,000 jobs last month, up from 50,000 in April. The company also revised its March number to 74,000 from 60,000. Nearly two-thirds of the jobs, 37,000, were at companies with fewer than 20 workers. The rest were at companies with 20 to 49 workers.

Also last week, software maker Intuit said its small-business customers added 35,000 jobs last month. It revised its April reading up to 35,000 from 20,000.

Both reports indicate that although small companies continue to hire cautiously, their job growth is gaining momentum. Surveys this year have found that many owners plan to hire modestly or keep their employment levels unchanged because they’re not sure about the outlook for their revenue and the economy.

Small businesses account for 99.9 percent of U.S. companies and about half the nation’s employment. Many economists say the economic recovery can’t gain strength unless small businesses increase their pace of hiring.

Economists predict that the economy will grow by a 2 percent annual rate from April through June, down from 2.4 percent in the first three months of the year.

A third report, a survey by the National Federation of Independent Business, said employment at small businesses was virtually unchanged, falling 0.04 workers per firm after five months of gains. The survey questioned 715 of the advocacy group’s members.

A broader look at hiring came Friday, when the Labor Department said the U.S. economy added 175,000 jobs in May a steady pace that showed strength in the face of tax increases and government spending cuts if not enough to reduce still-high unemployment.