Count back on a number line
Tape a big number line on the floor. For 12 − 4, a child stands on 12 and hops back 4 while the class counts "11, 10, 9, 8." Then they do the same hops with a finger on a paper number line. Moving their body makes "back" and "less" feel real.
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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