Fill a ten, then add more
Give kids two ten frames and say "Show me 13!" They fill the first frame completely, then put three on the second. Ask, "How many tens? How many more?" Doing it daily with different teen numbers builds the pattern.
Why it works: kids understand an idea best when they touch it, then draw it, then write it, the order the U.S. Department of Education recommends for elementary math.
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