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Algebra Lesson: Adding and Subtracting Signed Numbers

Learn how to add and subtract signed numbers with Mr. O’Byrne in this algebra lesson. Practice examples and rules provided. Homework assigned for further practice. Review and test your understanding.

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Algebra Lesson: Adding and Subtracting Signed Numbers

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  1. September 7th: Day #1 DO NOW: Write down the integer that describes each situation. a. 5 degrees above 0 b. A $100 withdrawal from the bank c. Loss of 15 yds d. 5 feet below sea level

  2. Before We Start • My Name is Mr. O’Byrne • This is Algebra • The first four minutes must be silent

  3. Now Back to the Do Now a. 5 degrees above 0 b. A $100 withdrawal from the bank c. Loss of 15 yds d. 5 feet below sea level

  4. Imagine You are on an elevator at the ground floor and then hit the 15 button. At the 15th floor, you realize you made a mistake and go back down 12 floors. Where did you end up?

  5. Ok So Today • AIM: How do we add signed numbers • HW: Complete HW #1 worksheet

  6. Homework Set up • Mild • Medium • Spicy

  7. Homework Expectations • This will be completed and turned in tomorrow • It will be graded • See me if you have questions

  8. Notes Simplify: 1) 4 + 3 = 2) (-2)+(-8) = 3) 5+(-6) = 3) -6 + 8 =

  9. From the Examples: Can we come up with a rule? Rules for adding signed numbers: • If the numbers are the same, add the #’s and the keep the sign • If the numbers are different, subtract the numbers and keep the sign of the number with the greatest absolute value

  10. Try these on your own 1. 12+(-10) 2. (-4)+(-8) 3. (-13)+3 4. -20+(-12) 5. (-8)+(-7)+3+(-5) 6. 4+(-2)+7+(-10)

  11. Now look at this • 5 + (-3) = • 5 – 3 = • NOTE: subtracting is the same as adding the opposite

  12. Rules for subtracting signed numbers 1. Keep, change, opposite 2. Follow the rules for addition 3. Work two at a time

  13. Notes 1) 2)

  14. Independent Practice • 8-(-2) • 8-3 • -8-(-4) • -41- (-30) • 10+(-7)-(-4) • -3+(-2)-(-5)+(-3)+11

  15. Closing • What was the AIM • How do we add signed numbers? • How do we subtract signed numbers?

  16. Exit Ticket

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