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### Chocolate FACTORy: Finding Factors of Numbers 1 Through 36

3-5

In this lesson students create rectangular arrays to
represent sizes of chocolate boxes. They find all of the factors of each number
up to 36 and learn the difference between prime and composite numbers. Then
they play an online game to practice finding factors for each product up to 36.### Fraction Feud: Comparing and Ordering Fractions

3-5

In this lesson, students use fraction bars to explore
how to compare sizes of fractions. They conclude with an online Calculation
Nation**game called Fraction Feud.**

^{®}### Fair and Square: Using Concrete-Pictorial-Abstract Activities to Maximize Area

3-5, 6-8

Students discover the
relationships between area and perimeter as they prep for playing Square Off, a
wonderful Calculation Nation^{®}game. This lesson helps students understand the math of area and perimeter, which will help to maximize their scores when playing the game. Creating human-sized rectangles and working with geoboards provide concrete experiences before moving on to pictorial and abstract work with area and perimeter of rectangles.

### A Squadron of Bugs: Introducing Division with Remainders with a Book

3-5

This hands-on lesson uses the book, *A Remainder of One*, by Elinor J. Pinczes, to introduce division with remainder. Students will enjoy the story context as they explore different remainder situations and model division with arrays.

### Getting the (Decimal) Point with Blocks: Multiplying Two Decimals Using Base Ten Blocks

3-5

Students will use
base ten blocks to model decimal multiplication. They will assign different
values to the different base ten blocks to explore the consistent relationship
between the types of blocks. They will also discover different factors for the
same product. These activities will help students develop a conceptual
understanding of decimal multiplication.### Egg Carton Designs: Constructing Arrays to Begin a Study of Multiplication

3-5

In this lesson, students are presented with a design
challenge: a company that produces egg cartons wants to create a package for 24
eggs. The company wants to know all of the possible ways to arrange 24 eggs
into rectangular packages. Students work together to find the arrays and
respond to the egg company. ### How Many Each? How Many Left?: Conceptualizing Division with Large Numbers

3-5

Division
is one of the most difficult operations for students to master, in part,
because there are many steps to keep track of and students often do not
understand the mathematical reasoning behind each step. In this lesson,
students will apply the strategies behind division, and learn how those strategies
can be translated into mathematical steps.### Making a Baseball Lineup: Using Baseball Statistics to Create a Baseball Game Simulation

3-5

In this activity students will analyze data and select fictional
baseball players based on player statistics. They will apply concepts of
probability to choose the order of batters on their team. After creating a
spinner for each player to represent the statistics, they use the spinners to
play a simulated baseball game.### Bean Salad: Using Algebraic Reasoning to Determine Quantities of Ingredients

3-5

In this lesson,
students use operations of whole numbers and/or fractions to determine the
precise numbers of three types of dried beans needed to make salads. The use of
manipulatives and partner activities provide differentiation and support
learning for students of varying abilities.### Magical Magic Squares: Constructing Simple Magic Squares in Odd-Numbered Square Arrays

Pre-K-2, 3-5

In this lesson,
students will use operations to discover
patterns with integers in magic squares. They will apply what they have learned when building their own magic
squares.