This engaging addition worksheet is tailored for first-grade students and aims to enhance their ability to add two-digit numbers using the number line addition method. The worksheet consists of five problems, and for each problem, learners are required to plot the first addend on the open number line. They will then proceed to mark each of the tens and ones that make up the second addend until they reach the sum of the two addends. This well-crafted worksheet is an excellent resource for helping students comprehend how to utilize place value while adding two-digit numbers. To further reinforce this skill, you may want to consider exploring Adding Two-Digit Numbers on an Open Number Line #2 and Adding Two-Digit Numbers on an Open Number Line #3!