The rockets landed mostly in the Sderot, Eshkol and Hof Ashkelon regions.
The Palestinian rockets were fired shortly after Israeli warplanes carried out air raids on the Gaza Strip.
Israeli warplanes fired missiles at targets in the central and southern parts of Gaza during the early hours of Monday. No casualties were reported.
The Israeli military frequently carries out airstrikes and other attacks on the Gaza Strip, saying the actions are being conducted for defensive purposes. However, disproportionate force is always used, in violation of international law, and civilians are often killed or injured.
Gaza has been blockaded since 2007, a situation that has caused a decline in the standard of living, unprecedented levels of unemployment, and unrelenting poverty for the Gazans.
The Tel Aviv regime denies about 1.7 million people in Gaza their basic rights, such as freedom of movement, jobs that pay proper wages, and adequate healthcare and education.