Last week, I went to professional development class on developing number sense in K-2. Before the class I had a vague familiarity with what a rekenrek was. After the class, I knew I wanted to use them in my classroom next year. I spent some time on Pinterest searching for ways teachers made them. I thought THIS IDEA (free on TeachersPayTeachers) was great. Debi Goodman used two magnetic curtain rods (Walmart) for a demonstration rekenrek.
I tweaked her version a little putting mine on a cookie sheet and using wooden pieces from Hobby Lobby. The bag of 20 was around $3. (Sorry about the fuzzy photo.)
I also plan to make a student set using pony beads. I am still deciding whether to put them on foam bases or use something else as a frame.
Here are some more interesting links:
K-5 Math Teaching Resources
Mrs. Kurtas on YouTube
Hope you're enjoying your summer!