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Integer Operations Practice

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Integer Operations Practice

Integer operations illustration

📊 Part 1: Addition and Subtraction

1. Calculate: (-8) + 15 = _____
2. Calculate: 12 - (-7) = _____
3. Calculate: (-9) + (-6) = _____
4. Calculate: (-14) - 8 = _____

✖️ Part 2: Multiplication and Division

5. Calculate: (-4) × 9 = _____
6. Calculate: (-6) × (-8) = _____
7. Calculate: 72 ÷ (-9) = _____
8. Calculate: (-45) ÷ (-5) = _____

🧠 Part 3: Mixed Operations

9. Calculate: (-3) + 8 - 12 = _____
10. Calculate: (-2) × 6 + 15 = _____
11. Word Problem: The temperature was 5°F at noon. It dropped 18°F by midnight. What was the temperature at midnight?
12. Word Problem: A submarine was at 120 feet below sea level. It rose 45 feet, then dove another 30 feet. What is its final depth? (Use negative integers for below sea level.)

Integer Operations Practice - Answer Key

Answer key illustration

📊 Part 1: Addition and Subtraction - Answers

1. (-8) + 15 = 7

Work: Start at -8, move 15 spaces to the right

2. 12 - (-7) = 19

Work: Subtracting a negative is the same as adding: 12 + 7 = 19

3. (-9) + (-6) = -15

Work: Both negative, add the numbers and keep the negative sign

4. (-14) - 8 = -22

Work: Start at -14, move 8 more spaces to the left

✖️ Part 2: Multiplication and Division - Answers

5. (-4) × 9 = -36

Work: Negative × Positive = Negative

6. (-6) × (-8) = 48

Work: Negative × Negative = Positive

7. 72 ÷ (-9) = -8

Work: Positive ÷ Negative = Negative

8. (-45) ÷ (-5) = 9

Work: Negative ÷ Negative = Positive

🧠 Part 3: Mixed Operations - Answers

9. (-3) + 8 - 12 = -7

Work: (-3) + 8 = 5, then 5 - 12 = -7

10. (-2) × 6 + 15 = 3

Work: (-2) × 6 = -12, then -12 + 15 = 3

11. Word Problem Answer: -13°F

Work: 5 - 18 = -13°F

12. Word Problem Answer: -105 feet (105 feet below sea level)

Work: Started at -120 feet, rose 45 feet: -120 + 45 = -75 feet, then dove 30 feet: -75 - 30 = -105 feet

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