This task gives children an opportunity to subtract a three-digit number including a zero that requires regrouping. The solutions show how students can solve this problem before they have learned the traditional algorithm.

Sample Learning Goals
Improve understanding of place value by using different sizes of papers for ones, tens, and hundreds.
Develop mental math strategies when taking apart and putting together numbers.
Use the “make a ten” strategy when counting and doing addition.
Develop a mental model of the basic properties of numbers including commutativity, associativity, and closure.

For this interactive, students find the missing addend/subtrahend for each equation to see how many shots they can make within the time limit. Please note you will need to have flash enabled on your browser to use the resource.

This document is the About the Cluster document created by the authors of the NC2ML Instructional Frameworks. Read this document prior to teaching the cluster in order to get insight into the clustering of the standards, mathematics to be taught, and important considerations.

This document is not remixable since the document has been written by creators of the NC2ML Instructional Frameworks.

This resource is from NC2ML.  It may not be remixed.This Standards Brief discusses strategies and representations second graders are taught for mult-digit addition and subtraction.  This is a great reading to share during a professional development with teachers or to hand out during family math nights.  

This 2 unit of number and operations lessons explores multi-digit addition and subtraction through 4 hands-on activities and 1 worksheet.

This short video and interactive assessment activity is designed to teach third graders about place value problems involving money.

This K-5 resource, provides different types of problem solving strategies for students to use when solving problems.

This unit was created by the Rethink Education Content Development Team. This course is aligned to the NC Standards for 2nd Grade Math.

This is a blended unit based on Unit 3 of the second grade Everyday Math series.

This unit will focus on strategies for solving subtraction problems within 20.  Students will learn strategies including: counting up and back on a open number line, using their knowledge of addition/subtraction facts within 10 to solve larger problems, and using doubles facts to solve subtraction problems.  This unit builds on the last unit as students lean on their addition knowledge to help with subtraction. The big goal is for students to develop fluency with subtraction facts within 20.

This resource is part of Tools4NCTeachers.

In this lesson students use the open number and various strategies to solve two-step story problems.

This short video and interactive assessment activity is designed to teach second graders an overview of addition (sums to 1,000).

This resource is from Tools4NCTeachers. This file contains a set of 4 tasks (including scoring rubric and student recording sheet).  The tasks may be used for instruction or assessment.Remix this resource to include student work samples or addtional tasks.

This resource is from Tools4NCTeachers. In this lesson, students develop strategies for adding 3-digit numbers, with a focus on adding in chunks.  Students build this strategy of adding in chunks by mentally adding 10 and 100 to numbers, and adding on the number line. Remix this lesson to include extension activities such as math stations.

This resource is part of Tools4NCTeachers.

In this lesson, students explore approaches for adding three two-digit numbers.

This resource is from Tools4NCTeachers.This file contains sample anchor charts to create with students. Anchor charts are to be made with students, then displayed as a classroom reference. Parents may also benefit from seeing anchor charts, as they provide a snapshot into the math class.Remix this resource to include pictures of your own anchor charts.

This resource is from Tools4NCTeachers.A Common Formative Assessment (CFA) provides a snapshot of current student understanding. It serves as a checkpoint, and may be used to guide future whole and small group instruction. This CFA addresses 2nd grade, Cluster 5 standards.

The Family Letters are intended to be sent home at the beginning and middle of the cluster. They explain big ideas of the cluster using family-friendly language. Families can also find tips for working with their children at home, digital games, videos, and books. This file contains both English and Spanish versions of the Family Letters.

This resource is from Tools4NCTeachers.Math games are fun, motivating, and provide opportunities for students to build number concepts, reasoning, and fluency. These games may be used as math stations or as whole group learning opportunities. This file contains directions and materials for Cluster 5 math games

The intended purpose of this document is to provide teachers with a tool to determine student understanding and suggest instructional moves that may help guide a student forward in their learning. It is not an exhaustive list of strategies.