Line it up and check
Hand each child a pencil, a crayon and a block. Ask them to line the ends up on the table edge and decide which is longest. Then they order them. Lining up from the same starting point is the habit that makes later measuring work.
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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