Adding Within 20 with Rekenreks

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.

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