How to Teach 3rd Grade Rounding and Estimation Using Number Lines

There are many good strategies for teaching rounding and estimation in 3rd grade math. One of the most common rounding strategies is the roller coaster method, where students look at the digit in the one's place and round down or up according to the rule. 

While this method does work, using number lines instead can really help students grasp the true concept of rounding instead of just memorizing rules.