# ALEX Classroom Resources

ALEX Classroom Resources
Subject: Mathematics (7)
Title: Grade 7 Mathematics Module 2, Topic C: Applying Operations With Rational Numbers to Expressions and Equations
Description:

In Topic C, students problem-solve with rational numbers and draw upon their work from Grade 6 with expressions and equations. They perform operations with rational numbers, incorporating them into algebraic expressions and equations.  They represent and evaluate expressions in multiple forms, demonstrating how quantities are related. The Integer Game is revisited as students discover “if-then” statements, relating changes in players’ hands (who have the same card-value totals) to changes in both sides of a number sentence. Students translate word problems into algebraic equations and become proficient at solving equations of the form px + q = r and p(x + q) = r, where p, q, and r, are specific rational numbers. As they become fluent in generating algebraic solutions, students identify the operations, inverse operations, and order of steps, comparing these to an arithmetic solution. The use of algebra to represent contextual problems continues in Module 3.

Subject: Mathematics (7)
Title: Grade 7 Mathematics Module 2, Topic A: Addition and Subtraction of Integers and Rational Numbers
Description:

In Module 2, Topic A, students return to the number line to model the addition and subtraction of integers (7.NS.A.1). They use the number line and the Integer Game to demonstrate that an integer added to its opposite equals zero, representing the additive inverse (7.NS.A.1a, 7.NS.A.1b). Their findings are formalized as students develop rules for adding and subtracting integers, and they recognize that subtracting a number is the same as adding its opposite (7.NS.A.1c). Real-life situations are represented by the sums and differences of signed numbers. Students extend integer rules to include the rational numbers and use properties of operations to perform rational number calculations without the use of a calculator (7.NS.A.1d).

Subject: Mathematics (7)
Title: Grade 7 Mathematics Module 2, Topic B: Multiplication and Division of Rational Numbers
Description:

Students develop the rules for multiplying and dividing signed numbers in Module 2, Topic B. They use the properties of operations and their previous understanding of multiplication as repeated addition to representing the multiplication of a negative number as repeated subtraction (7.NS.A.2a). Students make analogies to the Integer Game to understand that the product of two negative numbers is a positive number. From earlier grades, they recognize division as the inverse process of multiplication. Thus, signed number rules for division are consistent with those for multiplication, provided a divisor is not zero (7.NS.A.2b). Students represent the division of two integers as a fraction, extending product and quotient rules to all rational numbers. They realize that any rational number in fractional form can be represented as a decimal that either terminates in 0s or repeats (7.NS.A.2d). Students recognize that the context of a situation often determines the most appropriate form of a rational number, and they use long division, place value, and equivalent fractions to fluently convert between these fraction and decimal forms. Topic B concludes with students multiplying and dividing rational numbers using the properties of operations (7.NS.A.2c).

Subject: Mathematics (7)
Title: KutaSoftware: Algebra I - Adding Rational Numbers Part 1
Description:

This YouTube video will help explain how to teach adding rational numbers using a worksheet from Kuta Software. Kuta Software is free software for math teachers that creates worksheets in a matter of minutes. There are a series of three videos to fully teach this concept. The videos are labeled Adding Rational Numbers Part 1, Adding Rational Numbers Part 2, and Adding Rational Numbers Part 3. This video can be played to introduce a lesson on adding rational numbers. This video is 11 minutes and 35 seconds in length.

Subject: Mathematics (7)
Title: KutaSoftware: Algebra 2 - Adding Rational Numbers Part 2
Description:

This YouTube video will help explain how to teach adding rational numbers using a worksheet from Kuta Software. Kuta Software is free software for math teachers that creates worksheets in a matter of minutes. There are a series of three videos to fully teach this concept. The videos are labeled Adding Rational Numbers Part 1, Adding Rational Numbers Part 2, and Adding Rational Numbers Part 3. This video can be played as a continuation of a lesson on adding rational numbers. This video is 10 minutes and 36 seconds in length.

Subject: Mathematics (7)
Title: KutaSoftware: Algebra 1 - Adding Rational Numbers Part 3
Description:

This YouTube video will help explain how to teach adding rational numbers using a worksheet from Kuta Software. Kuta Software is free software for math teachers that creates worksheets in a matter of minutes. There are a series of three videos to fully teach this concept. The videos are labeled Adding Rational Numbers Part 1, Adding Rational Numbers Part 2, and Adding Rational Numbers Part 3. This video can be played as a continuation of a lesson on adding rational numbers. This video is 7 minutes and 34 seconds in length.

Subject: Mathematics (7)
Title: Adding and Subtracting Rational Numbers Assessment