Add Three and Four 2-digit Numbers by Making 10s

This lesson teaches how to add 3 to 4 two-digit numbers vertically by making tens. It reviews key concepts like decomposing numbers and the commutative property of addition. Through examples involving chocolate chip cookies, students learn to set up addition problems vertically, add ones and tens separately, and understand that the order of addends does not affect the sum. The lesson concludes with a summary of the vertical addition process.

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