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The Number Line

The Number Line

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The Number Line

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Presentation Transcript

  1. The Number Line

  2. Make your Own Number Line!

  3. Vocabulary • Positive numbers: numbers that are greater than 0. These numbers are located to the right of 0 on a number line. Positive numbers can be written with or without a plus sign. • Examples: 3, +3, 5, +6

  4. Vocabulary • Negative numbers: numbers that are less than 0. These numbers are located to the left of 0 on a number line. Negative numbers must always be written with a negative (minus) sign. • Examples: -3, -4, -5, -10

  5. Brainstorm • When do we use or see negative numbers?

  6. In your Notes: IMPORTANT • The number 0 is neither positive nor negative!

  7. These are the elevations and depressions of some locations. Plot these points on a number line.

  8. Questions • What point on the number line represents sea level? • Which location is closest to sea level? How do you know? • Is the location mentioned in the question before above or below sea level? • Which two locations are the same distance from sea level? Are these locations above or below sea level? • Which location has the least elevation? How do you know?

  9. Whiteboards! Using your paper number line to help, write a number line from -10 to 10 and plot these points on your whiteboards: • 5 • -10 • 8 • -9 • 6 • -2

  10. Vocabulary • Integers: The set of all whole numbers and their opposites. • …-5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5…

  11. Vocabulary • Opposites: Two numbers are opposites if, on a number line, they are the same distance from 0 but on different sides of 0. • Examples: • 5 and -5 • 2.15 and -2.15

  12. Whiteboards! • Give the opposite of the following numbers: • 2 • -9 • -45 • 16 • -20