Teachers, save “Math: Subtraction to 20 Using Number Lin…” to assign it to your class.

1. Select 2. Listen to lesson and direction in the View Instruction section. 3. Use the or to and the number line to solve each equation. 4. Record the answer for the missing number. 5. Use the to clear the number line and move onto the next equation. 6. Choose if you want to pause and return to complete, or if you are done and ready to save this to your journal.