You can also use these stamp cards to reinforce the fact that
there are never more than 9 units (or nine 10s or nine 100s, etc.). You
throw a bunch of cards out and then trade for a higher place value
card whenever you count 10. So, if you have 23 10s cards you'd trade
10 10-cards for a 100 card, then another 10 10-cards for a 100 card.
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