Unit 1: Module 1: Place value, rounding, and algorithms for addition and subtraction

"In this module, students extend their work with whole numbers. They begin with large numbers using familiar units (hundreds and thousands) and develop their understanding of millions by building knowledge of the pattern of times ten in the base ten system on the place value chart (4.NBT.1). They recognize that each sequence of three digits is read as hundreds, tens, and ones followed by the naming of the corresponding base thousand unit (thousand, million, billion)." Eureka Math/EngageNY (c) 2015 GreatMinds.org