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ERIC is the largest database devoted to education (1910 - present). To focus your search try limiting to either TI Title, or perhaps AB Abstract, or even SU
Descriptors. You may also want to limit yor search by checking the box that limits results to "Peer Reviewed" articles. If you need articles that report original research in education - limit the "Pulbication Type" to Reports - Research. You can also locate articles that report original research in education by adding the word "study" to one of the search blanks and limiting to AB Abstract.
To focus on Elementary Math Education:
1. Scroll down the page to the "Education Level" options
2. While pressing the control-key "Ctrl" - scroll through the options and highlight both "Elementary Education" and "Elementary Secondary Education" (it is also possible to select specific grades as well (e.g. Grade 1, Grade 2, etc.)