# Explained

• ## Resources By Unit

Below is a brief description of the topics for each unit. Links to videos are provided to help you understand instructional strategies being taught in class.

Module/Unit 4:  Place Value, Comparison, Addition and Subtraction to 40

Module 4 builds upon Module 2’s work with place value within 20, now focusing on the role of place value in the addition and subtraction of numbers to 40. Students study, organize and manipulate numbers within 40.  They compare quantities and begin using the symbols for greater than (>) and less than (<). Addition and subtraction of tens is another focus of this module as is the use of familiar strategies to add two-digit and single-digit numbers within 40.  Near the end of the module, the focus moves to new ways to represent larger quantities and adding like place value units as students add two-digit numbers.

Some of the video links below will take you to another school website, where the teachers have created short homework videos to help parents help their students. If looking for help on a lesson, refer to the lesson number in the top right corner of a worksheet. Example below.