Adding numbers using a number line is a visual and kinesthetic strategy that helps students develop their understanding of addition and mental math skills. To use this strategy, students draw a number line and place the first number at the starting point and then "jump" to the right to add the second number. For example, to add 3 + 5, students start at the number 3 on the number line and jump five spaces to the right to reach the sum of 8. This strategy helps students understand the concept of addition as moving forward on a number line and can also help them visualize and solve more complex addition problems. Through practice and exposure to a variety of number line-based activities, students can develop their addition skills and number sense.

Students will build their number sense by using different strategies to add numbers on a 1-20 number line, learning that there are many ways to THINK about numbers and many ways to ADD them.