Objective: Write and interpret two-digit numbers as addition sentences that combine tens and ones.
Taking student understanding of place value a step further, Lesson 4 asks students to decompose and compose two-digit numbers as addition equations. Students develop an understanding that “34 is the same as 30 + 4,” as they move between writing the number when given the equations and writing the equations when given a number. Throughout these lessons, students use concrete objects and/or drawings in order to support their understanding and explain their thinking.
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