Lesson: Adding Numbers up to 20 on a Number Line Mathematics • 1st Grade

In this lesson we will learn how to add within 20 by jumping forward in ones on a number line.

Lesson Video

Q1:

Use the number line to complete the following addition sentence.

Q2:

On this number line, Elizabeth started at 13 and counted forward until she reached 18.

Which number sentence describes what Elizabeth did?

Q3:

I start at a number and count forward. Does this represent adding or subtracting?