Students decompose numbers less than or equal to 10 into pairs in more than one way by using objects or drawings, and they will record each decomposition by a drawing or equation (e.g. 5= 2 + 3 and 5 = 4+1).

In this video, a student explains how to use the area model for multiplication. The area model is a multiplication strategy based on decomposing numbers basedon place value.

Students bury various pieces of trash in a plotted area of land outside. After two to three months, they uncover the trash to investigate what types of materials biodegrade in soil.

In a multi-week experiment, students monitor the core temperatures of two compost piles, one control and one tended, to see how air and water affect microbial activity. They daily aerate and wet the "treated" pile and collect 4-6 weeks' worth of daily temperature readings. Once the experiment is concluded, students plot and analyze their data to compare the behavior of the two piles. They find that the treated pile becomes hotter, an indication that more microbes are active and releasing heat. Through this activity, students see that microbes play a role in composting and how composting can be used as a carbon management process.

In this assessment task students will solve a story problem decomposing numbers from 11 to 19. They can use manipulatives and teachers can prompt students to use the Ten Frame to show bundles of tens and ones. Teachers can ask students to explain their thinking or can take a picture as evidence of proficiency. An assessment sheet and rubric are provided.

This lesson is Day 2 in a series of 12 lessons around fraction equivalences and comparisons.

This game may be played with one or two people. It reviews fractions on a number line, adding fraction with like denominators, and equivalent fractions. For an extra challenge, you can even break up your moves across multiple tracks (e.g., if your card reads 1/2, you could move 1/4 and 2/8).

https://www.nctm.org/Classroom-Resources/Illuminations/Interactives/Playing-Fraction-Track/

The area model can be used when multiplying any two numbers, including decimals. This video demonstrates how to multiply using the area model when a decimal is involved.

In this lesson, students explore solid waste and its effects on the environment. They will collect classroom trash for analysis and build model landfills in order to understand the process and impact of solid waste management. Students will understand the role of engineers in solid waste management.

This resource is from Tools4NCTeachers. This file contains a set of 2 tasks (including scoring rubrics and student recording sheets).  The tasks may be used for instruction or assessment.  Each focuses on strategies for adding and subtracting within 20.Remix this resource to include student work samples or addtional tasks.

This resource is from Tools4NCTeachers.This lesson calls for students to use a ten frame to represent ten ones. Students will demonstrate and verbalize that ten objects is the same as “ten”. They will model teen numbers as ten ones and some extra ones, and demonstrate an understanding that one manipulative goes in each square of the ten frame (builds on one to one understanding).Remix this lesson to share extension ideas or student work-samples.

This resource is part of Tools4NCTeachers.

In this lesson, students solve a word problem using a strategy of choice and share the strategy to develop the concept of representing and solving problems involving addition and subtraction within 20. This lesson format may be used with any problem type appropriate for the grade.

This resource is from Tools4NCTeachers.This is a set of two tasks, which may be used for instruction or assessment.  Each file contains a separate task and rubric.  Remix this resource to include extension ideas or addtional tasks, or samples of student-work.

This resource is part of Tools4NCTeachers.

This file contains a set of 17 problem solving tasks around decomposing numbers within 10 (where both addends are unknown). Each of the tasks has its own recording sheet, which may be copied for the students. Page 1 contains a general scoring rubric, and page 2 contains sample student work.

We'd love to see your student work samples! Please consider remixing this task to include work samples.

This resource is from Tools4NCTeachers.In this lesson, students partition circles into halves, thirds and fourths as they create fraction flowers.  Student recording sheets and sample pictures of student work are included within the lesson.  Links to virtual tools and extension ideas are also provided.  Remix this lesson to include pictures of your students' work!

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 part of Tools4NCTeachers.

In this task, students apply their place value understanding to compose and decompose 2-digit numbers. A scoring rubric is included. The task may be used for instructional or assessment purposes.

This resource is from Tools4NCTeachers. In this lesson, students will compose a teen number into ten ones and some extra ones.  They will work to identify and record how many ones are on the ten frame, off the ten frame, and the total. Remix this lesson to include extension ideas or student work samples.

This resource is part of Tools4NCTeachers.

This task may be used for instructional or assessment purposes. Students are asked to place a set of chips on a 10 frame, and state how many more are needed to make ten.

An extension would be to repeat this task without the use of the ten frame. Let's hear your extension ideas for this task. Remix this resource, and share your ideas!

This resource is part of Tools4NCTeachers.

This task, which may be used for instructional or assessment purposes, asks students to find the missing number needed to make ten. A scoring rubric is included.

We'd love to see your students' approaches to this task! Remix this lesson to share samples of student work.

This resource is part of Tools4NCTeachers.

This task, which may be used for instructional or assessment purposes, asks students to find the missing number needed to make ten. A scoring rubric is included. We'd love to see your students' approaches to this task! Remix this lesson to share samples of student work.