EngageNY 60 min(s)

In this lesson, students continue to consider tens and ones as they identify 10 more, 10 less, 1 more, and 1 less than any two-digit number. This work helps students attend to the parts within a two-digit number, a skill that is critical to adding two-digit numbers within 100. Students recognize that when looking at a number such as 37, they focus on the tens place when adding or subtracting 10 and on the ones place when adding or subtracting 1. Students also explore numbers such as 89, where adding 1 more creates another ten.