## Common Core State Standards for Mathematics

Grade(s) 3 resources related to the following standard:
Operations and Algebraic Thinking
Represent and solve problems involving multiplication and division.
4. Determine the unknown whole number in a multiplication or division equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 × ? = 48, 5 = ÷ 3, 6 × 6 = ?.

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This 5 1/2-minute video explains how to create a factor tree to find the prime factorization of a number. It demonstrates the process for 6, 24, and 525.
Lecture/Presentation, Video
This 4-minute video introduces the definition of a prime number and illustrates it through a discussion of factors and composite numbers. It makes use of the definition to explain why 1 is not a prime and ends with a question for the viewer to ponder.
Lecture/Presentation, Video
This interactive game for one or two players develops students' fluency with multiplication facts, understanding of the relationship between factors and products, and strategic thinking. Players take turns moving markers on a factor list and claiming their products on a board displaying all the products of the numbers 1-9. The first player to claim four in a row wins the game. The factors and number needed to win are customizable. The resource includes links to related lessons.
Activity, Game, Interactive Media
This 7-minute video features Drew Crandall working with his third grade class to develop concepts involving properties of operations and the relationship between multiplication and division. His approach allows students to learn from each other, to construct and revise their own meaning, and to develop communication skills. A downloadable transcript of the video is available (doc).
Activity, Instructional Strategy, Video
With this interactive Java applet, students use rectangular models to explore and practice division. The user can choose any whole number dividend less than 100 and a divisor; the applet graphically shows the quotient and any remainder and displays the related multiplication equation. In the "Test Me" option users are presented with division problems, which they represent visually and with an equation, and the opportunity to check their answers.
Activity, Interactive Media
This interactive Java applet use arrays and three different computational models (Grouping, Common, or Lattice) to help students visualize and understand the process of multiplication of whole numbers. In each method the user drags sliders to adjust the two factors and then observes the resulting changes in the rectangular array and in the respective algorithm and product.
Activity, Interactive Media
Grade Level: 2, 3, 4, 5
Resource is part of a PD collection
This interactive Flash game helps students understand remainders while developing reasoning skills and facility with multiplication and division facts. Playing against the computer, the student creates division equations from 3 randomly-generated numbers (1-6) with the goal of making the largest remainders.
Activity, Game, Interactive Media