Subtracting within 20 with Rekenreks

A Rekenrek can be used to show a variety of subtraction strategies. Consider the difference 13 - 6. By "counting back", move 13 beads and then remove 6 beads one at a time. By "making a ten", move 13 beads and then remove 3 beads (to make a ten), and then remove another 3 beads. By "making a ten" another way, move 10 beads on the top row and 3 beads on the second row, then remove 6 beads from the top row. By "thinking addition", move 6 beads and then think how many beads should be added to make 13.

Subtracting within 20 using the Brainingcamp Rekenreks virtual manipulative.

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