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Lesson 2 Contents Example 1Add Integers on a Number Line Example 2Add Integers with the Same Sign Example 3Add Integers on a Number Line Example 4Add Integers with Different Signs Example 5Use Integers to Solve a Problem Example 6Add Three or More Integers

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Example 2-1a Find. Start at zero. Move three units to the right. From there, move four more units to the right. Answer: 3 4

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Example 2-1b Find. Answer: –7

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Find. Example 2-2a Answer: –9 Add and. Both numbers are negative, so the sum is negative.

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Example 2-2b Answer: –11 Find.

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Example 2-3a Start at zero. Move 7 units to the right. From there, move 11 units to the left. Answer: 7 –11

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Find. Example 2-3b Start at zero. Move 2 units to the left. From there, move 9 units to the right. Answer: –2 9

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Find each sum. a. b. Example 2-3c Answer: 3 Answer: –3

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Find. Example 2-4a Answer: 1 To find –9 + 10, subtractfrom. The sum is positive because

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Example 2-4b Answer: –7 Find. To find 8 + (–15), subtract from The sum is negative because

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Find each sum. a. b. Example 2-4c Answer: –3 Answer: 5

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WordsThe temperature at dawn was –22°F. It had risen 19 degrees by noon. What was the temperature at noon? Example 2-5a Weather On February 1, the temperature at dawn was –22°F. By noon it had risen 19 degrees. What was the temperature at noon? Temperature at dawn plus increase by noon equals temperature at noon. 19 –22 Equation x VariableLet x the temperature at noon.

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Example 2-5b Solve the equation. To find the sum, subtract Answer: The temperature at noon was –3°F. The sum is negative because

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Example 2-5c Hiking Dave started his hike at 32 feet below sea level. During the hike he gained an altitude of 29 feet. At what altitude did Dave complete his hike? Answer:Dave completed his hike at 3 feet below sea level.

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Example 2-6a Commutative Property Additive Inverse Property Identity Property of Addition Answer: –4 Find.

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Example 2-6b Commutative Property Associative Property Answer: –4 Simplify. or –4 Find.

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Example 2-6c Answer: –9 Answer: 10 Find each sum. a. b.

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End of Lesson 2

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IntegersIntegers Add, subtract, multiply, and divide.

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