Addition Beads (PDF) to demonstrate the teens.Addition Strips (grey-scale PDF) -- these go with the addition board. I read somewhere that once you get past ten with addition, you can demonstrate grouping by replacing, say 9 + 6 with a ten and a five.
It is the same as these, except in black and white, but I realize I didn't picture them previously as gifs, because they didn't look good that way.
Here they are in laminated, file folder form:
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