Students practice and gain proficiency with recognizing number lines and writing corresponding number sentences with this exercise. Two pages of open number lines are included covering addition, subtraction, and addition and subtraction occurring more than one time within one number line. Missing parts of number sentences vary to encourage student thinking and help test preparation. Eliminate student confusion of whether number lines are addition or subtraction by using the teacher tips that are included. This covers Texas TEKS 2.7C "Represent ..and solve addition and subtraction where unknowns may be any one of the terms in the problem" dual coded with 2.1C "Select tools...to solve problems."