Lesson: Adding Ones to Two-Digit Numbers without Regrouping Mathematics • 1st Grade

In this lesson, we will learn how to add a one-digit number to a two-digit number without crossing a ten and model this with place value equipment.

Lesson Plan

Students will be able to

add a one-digit number to a two-digit number without regrouping using place value models,
add a one-digit number to a two-digit number without regrouping using place value charts,
use place value language to describe adding a one-digit number to a two-digit number without regrouping,
solve word problems that involve adding a one-digit number to a two-digit number without regrouping.

Q1:

There are 20 people in a swimming pool. If two more jump in, how many people will be there in the swimming pool?

Q2:

There are 34 students playing in the park. Anthony, David, and Daniel decided to join them. Find the total number of students.

Q3:

Is , or ?