Blocks before digits
When kids are stuck on place value or regrouping, go back to base 10 blocks. Have them build 64, trade a ten for ten ones, and then take away 27. Once they see it with blocks, the written steps finally make sense.
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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