Mixed Addition & Subtraction Within 1000 With Regrouping – Worksheets + Answer Keys | PDF & Google Docs Versions | Aligned to CCSS.2.NBT.B.7Looking for a ready-to-use, standards-aligned resource to support your students' understanding of addition and subtraction within 1000 with regrouping? This versatile pack includes 4 progress monitoring worksheets featuring mixed addition and subtraction problems with regrouping, all within 1000, and comes with complete answer keys for easy grading or st