Durable and double-sided, these handy wipe-off resources are an excellent visual aid in helping children understand fractions. Hand one out to each of your students to use during an individual or group math activity. An essential math curriculum-support product, keep these handy wipe-off tools stored in your math center. Plastic. (30 pcs. per unit) 12 x 4 Erases best with damp cloth or tissue. © OTCWipe-off fraction number lines are my favorite product to use when first introducing the concept of placing fractions on a number line to my 3rd graders. As my students become more confident, these number lines are perfect to use at math centers for independent practice.Molly, 3rd Grade Teacher, Maryland