A Rekenrek can be used to show a variety of addition strategies. Consider the sum 7 + 8. By "counting on", move 7 beads and then move 8 more beads one at a time. Using a "double plus one", move 7 on each of two rows, and then add 1 to the bottom row. Using a "double minus one", move 8 on each of two rows, and then remove 1 from the top row. By "making a ten", move 10 on the top row and 5 on the bottom row. By "making fives", move 5 + 2 on the top row and 5 + 3 on the bottom row.
Adding Within 20 using the Brainingcamp Rekenreks virtual manipulative.
Brainingcamp virtual manipulatives can be used anywhere with no setup, cleanup, or lost parts. They are highly effective at engaging today’s digital learners and helping them bringing abstract math concepts to life.
Brainingcamp produces virtual manipulatives for iPads, Chromebooks, PCs, and Macs.