Give your students the practice they need with these no-prep worksheets perfect for independent work, homework, review, or substitutes! They will practice addition and subtraction within 100 using regrouping strategies, partial sums, the relation between addition and subtraction, and mental math. This resource includes 18 practice pages to cover this topic.This resource aligns to CCSS.Math.2.NBT.B.5: Fluently add and subtract within 100 using strategies based on place value, properties of operat