This set of 240 cards for grades K-1 allows you to add cards to your F.U.N.™ Empty Number Line System (sold separately). Demonstrates that the magnitude of the numbers increases as a student is ´counting up´ and decreases when ´counting down´. Additionally, decomposing numbers into pairs can be displayed, and comparing one digit or two digit numbers can be modeled. The number line can be used to quickly indentify ´10 more´ or ´10 less´, as well as many other concepts.