Objective: Add a pair of two-digit numbers when the ones digits have a sum less than or equal to 10.
In Lesson 12, students add a pair of two-digit numbers when the ones digits have a sum less than or equal to 10 (1.NBT.4). They continue using strategies developed in Module 4. For example, when adding 47 + 23, students may choose to decompose the second addend into 20 and 3. They then add 20 to 47, making 67, and then add the remaining ones. Other students may choose to add the ones to the first addend and then add on the remaining tens, as shown to the right.
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