This interactive activity adapted from the Wisconsin Online Resource Center challenges you to plan, measure, and calculate the correct amount of roofing material needed to reroof a house.

Determine how to do scalar multiplication with matrices. Check understanding with a quiz. [2:21]

Explore how to multiply matrices using scalar multiplication and then assess learning with a quiz. [6:23]

The purpose of this task is to help students see that 4_(9+2) is four times as big as (9+2). Though this task may seem very simple, it provides students and teachers with a very useful visual for interpreting an expression without evaluating it.

This short video and interactive assessment activity is designed to teach fourth graders about selecting the incorrect statement.

The CyberSquad must divide 35 candies evenly among seven gargoyles in this video segment from Cyberchase.

In this video segment from Cyberchase, Jackie shows Buzz, Delete and Harold how to deal out rounds (or sets) of objects to solve a problem.

This short video and interactive assessment activity is designed to teach third graders about shortening multiplication expressions (associative property).

Skittles - yum!! You will instantly have your student's attention when you teach about arrays using Skittles. This detailed lesson walks you through the steps, provides worksheets for varying math levels, and includes a video of the lesson in action.

Demonstrates how to use the zero product property to solve quadratic equations. [9:50]

Download these free worksheets to sharpen your math skills. These St. Patrick's Day math worksheets focus on topics such as patterning, comparing numbers, counting, word problems, addition, multiplication, and mixed operations.

When you see equations in the form of a(x+b) =c, you can remove the bracket and rewrite the equations into ax+ab =c using the distributive property. In this video, you will see how to make use of this property to help solve linear equations. [1:27]

This task provides a familiar context allowing students to visualize multiplication of a fraction by a whole number. This task could form part of a very rich activity which includes studying soda can labels.

On this site from Aussie School House Teachers on the Web, an Australian K-6 teacher defines and illustrates more than 500 mathematical terms. It is a wonderful dictionary featuring clear and often interactive graphics, great colors, and lots of examples. It has been recently updated adding more terms, charts, and an app.

Download these free worksheets to sharpen your math skills. These Thanksgiving math worksheets focus on topics including comparing, patterning, addition, subtraction, multiplication, and division.

Models how to solve a two-step word problem involving multiplication and addition or subtraction by drawing a picture and writing equations. [3:32] CCSS.Math.Content.3.OA.D.8 Solve two-step word problems using the four operations.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Models how to solve a two-step word problem involving multiplication and division by drawing equal groups and writing equations. [5:00] CCSS.Math.Content.3.OA.D.8 Solve two-step word problems using the four operations.

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Demonstrates strategies for determining a missing number in multiplication and division equations. [5:18]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

Download these free worksheets to sharpen your math skills. These Valentine's Day-themed math worksheets focus on topics such as patterning, multiplying and dividing, counting, and statistics.