Warm Up 8/13. Lesson 4: Efficiently Adding Integers and Other Rational Numbers Objectives I can interpret sums of rational numbers by describing real-world.

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Presentation transcript:

Warm Up 8/13

Lesson 4: Efficiently Adding Integers and Other Rational Numbers Objectives I can interpret sums of rational numbers by describing real-world contexts. I can apply properties of operations as strategies to add and subtract rational numbers.

Stand Up, Hand Up, Pair Up When playing the Integer Game, you have 3 cards in your hand with a sum of −15. Then, you draw a (−5) card. Using addition, how would you write an equation to represent your score? What is the absolute value of 15? Why? What is the sum of −4 + (−10)? Use a number line In what direction does the arrow point on a number line for a negative number? What is an additive inverse of 5? What is the additive inverse of −9? What is the additive inverse of a number?

Example 1: Adding with the SAME SIGN

Example 2: Adding with the SAME SIGN

Add integers with the same sign by adding the absolute values and using the common sign. Adding with the SAME SIGN: RULE

Warm Up 8/14

Example 3: Adding with Opposite Signs

Use the following terms in your rule:  greater absolute value  lesser absolute value  subtract  sign ________ the _______________ from the greater absolute value. Then use the _______ of the integer with the ____________. Key-concept (Input)

Example 4: Using addition with Rational Numbers

Complete the Lesson 4 problem set Make sure your Exercises were completed correctly. Lesson 4 Problem Set

Adding with the OPPOSITE SIGNS: RULE Add integers with opposite signs by subtracting the absolute values and using the sign of the integer with the greater absolute value.