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Positive and Negative Numbers

This text introduces the concepts of positive and negative numbers, explaining their definitions and uses in real-world scenarios, such as temperature measurement and financial transactions. It provides examples of temperature changes, illustrating how to calculate new temperatures after given increases or decreases. The content also emphasizes the comparison between positive and negative numbers, reinforcing the idea that positive numbers are always greater than negative ones. Engaging exercises and real-life applications make the learning process interactive and practical.

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Positive and Negative Numbers

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  1. Positive and Negative Numbers

  2. 4 3 2 1 0 -1 -2 -3 It is 2oC • The temperature drops by 3 degrees • What temperature is it now? -1oC

  3. 4 3 2 1 0 -1 -2 -3 It is 4oC • The temperature drops by 5 degrees • What temperature is it now? -1oC

  4. 4 3 2 1 0 -1 -2 -3 4 3 2 1 0 -1 -2 -3 4 3 2 1 0 -1 -2 -3 It is -2oC 4 3 2 1 0 -1 -2 -3 • The temperature rises by 3 degrees • What temperature is it now? +1oC

  5. 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 It is 10oC • The temperature drops by 15oC • What is the temperature now? -5oC

  6. 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 It is 15oC • The temperature drops by 20oC • What is the temperature now? -5oC

  7. Definition • Positive number – a number greater than zero. 0 1 2 3 4 5 6

  8. Definition • Negative number – a number less than zero. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

  9. Definition • Opposite Numbers – numbers that are the same distance from zero in the opposite direction -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6

  10. 7 -7 opposite Definition • Integers – Integers are all the whole numbers and all of their opposites on the negative number line including zero.

  11. Negative Numbers Are Used to Measure Under Sea Level 30 20 10 0 -10 -20 -30 -40 -50

  12. Negative Numbers Are Used to Show Debt Let’s say you borrowed $5 from your friend, that means you owe your friend $5. You have -$5

  13. Positive & Negative Numbers Working with positive and negative numbers is like driving in traffic. You have to watch the traffic signs and follow the driving rules.

  14. Hint • If you don’t see a negative or positive sign in front of a number it is positive. 9 +

  15. Word Clues Positive Gain Increase Received Got Greater Negative Below Loss Lost Owe less

  16. You try: Write this Number • Ten degrees below zero • I owe you $83 • I lost 28 marbles • I earned 3 new DS games for getting all fours on my report card.

  17. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Compare positive and negative numbers -4 4 Remember Positive numbers are always bigger than negative numbers.

  18. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Compare positive and negative numbers -5 -1 Remember Positive numbers are always bigger than negative numbers.

  19. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Compare positive and negative numbers -9 0 Remember Positive numbers are always bigger than negative numbers.

  20. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Compare positive and negative numbers -13 -26 Remember Positive numbers are always bigger than negative numbers.

  21. -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Compare positive and negative numbers 6 -8 Remember Positive numbers are always bigger than negative numbers.

  22. Great Job! • Page 19 # 10-18 Tues • Page 21 #3-6 Wed

  23. Fill in the number line with positive and negative numbers 0

  24. >, < or = -13 -26 -4 4 -9 0 6 -8

  25. 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 20 15 10 5 0 -5 -10 -15 • What temperature is 10 degrees colder than -5 • What temperature is 10 warmer than -5

  26. Order the numbers from least to greatest • 4, -4, 2, 0, -1 • -7, 3, -5, 2, 7

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