Unit 1 Place Value and Multi-Digit Addition and Subtraction

When students understand the structure of the base ten system, they can quantify the value of larger numbers and manipulate them as a strategy for multi-digit addition and subtraction, mental math, estimations, and comparisons.

In this unit, students focus on place value and the uniformity of the base-ten system. This allows students to generalize their knowledge of place value and use this understanding to perform multi-digit addition and subtraction within 1,000,000. This unit will help students gain a practical understanding of addition and subtraction and the relationship between the two operations in a real world context. Students will also apply their understanding of place value in order to estimate and round numbers as a strategy to support mental math. Mental math will provide students with methods to estimate sums and differences as well as validate their answers.