## Common Core State Standards for Mathematics

Grade(s) 4 resources related to the following standard:
Number and Operations in Base Ten
Use place value understanding and properties of operations to perform multi-digit arithmetic.
6. Find whole-number quotients and remainders with up to four-digit dividends and one-digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

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In this lesson, students learn about modular arithmetic and how to apply it in real world situations involving remainders. Students are introduced to modular notation (# mod #) and learn how to perform modular arithmetic. Lists of prerequisites, suggested lesson outlines and links to individual activities and to worksheets and discussions are included.
Activity, Interactive Media, Lesson Plans
This free iOS app uses virtual base-10 blocks to help students develop their understanding of place value and computation strategies with multi-digit numbers. Students use the number pieces to represent multi-digit numbers, regroup, add, subtract, multiply, and divide.
Interactive Media, Mobile App
Grade Level: K, 1, 2, 3, 4, 5
This interactive Java applet, based on the familiar game Connect Four, gives students practice in applying order of operations. Two players take turns evaluating expressions involving the four basic operations (addition, subtraction, multiplication and division). If correct, the player places a black or red checker on the board with the goal of connecting four in a row ( horizontally, vertically, or diagonally) before the opponent does. Players choose from four levels of difficulty; they can adjust the timing feature and whether to involve exponents and/or parentheses.
Activity, Game, Interactive Media
Grade Level: 3, 4, 5, 6+
In this 7-minute video 4th grade teacher Lynn Simpson demonstrates and discusses a lesson that develops children's understanding of division. Her method emphasizes the role of discourse and multiple strategies in helping students create meaning. The resource includes a transcript of the video (doc) and questions for teacher discussion.
Instructional Strategy, Lesson Plans, Video
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