A number line can also be used to represent both positive and negative integers as well. Writing numbers on a number line makes comparing numbers and answering math questions easier. We always move right to add, move left to subtract.
This set includes 12 number lines, 6 are have numbers (1-5, 1-10, 1-20) and the other 6 have no numbers. 6 cards are Addition, 6 cards are subtraction.