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 Plan

Students will be able to

model the addition of numbers within 20 on a number line,
write addition equations matching number lines,
use a number line to count on and find a sum within 20,
count on from either addend using a number line and express a preference,
identify the largest number in an addition sentence and count on from there on a number line to find the sum.

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?