EngageNY 60 min(s)

In this lesson, students begin to focus on adding ones with ones or adding tens with tens. They recognize single-digit addition facts as they solve, for example, 15 + 2, 25 + 2, and 35 + 2. When adding 35 + 2, students see that they are adding 5 ones to 2 ones, while the tens remain unchanged, to make 3 tens 7 ones or 37. By contrast, when adding 12 + 20, students see that they are adding 2 tens to 1 ten to make 3 tens 2 ones or 32.