Introduce subtraction within 20 on open number lines with this animated PowerPoint.
First, how to subtract on a number line is introduced. Students learn to put the two numbers on the number line and hop to find the difference.
Then, students will play Beat the Clock. The students will try to draw on their number line to find the answer before the slide is finished.
A worksheet is provided. This worksheet can be used with the PowerPoint and can be used for repetitive practice by playing a game that can be great for math centers.
Check out all these resources for Open Number Lines