1 / 20

What : adding and subtracting integers Why:

Today’s Lesson:. What : adding and subtracting integers Why: To review and apply the rules for adding and subtracting integers . . ADDING INTEGERS:. DIFFERENT SIGNS. SAME SIGNS. _______________. ADD. SUBTRACT . Keep Sign of Larger Absolute Value. ______ _______. Keep

adriel
Télécharger la présentation

What : adding and subtracting integers Why:

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Today’s Lesson: What: adding and subtracting integers Why: To review and apply the rules for adding and subtracting integers.

  2. ADDING INTEGERS: DIFFERENT SIGNS SAME SIGNS _______________ ADD SUBTRACT Keep Sign of Larger Absolute Value ______ _______ Keep Sign 3 + 7 = 10 -3 + -7 = ? -4 + 2 = -2 4 + -2 = ? Video

  3. examples: -33 -101 -21 95 -79 220

  4. SUBTRACTING INTEGERS: DID YOU KNOW? ALL Subtraction problems are ____________________ problems in disguise! WHY? Because we can re-write every subtraction problem as an addition problem. addition 8 – 12 = 8 + (- 12) = -4 5 – (-1) = 5 + 1 = 6 KEEP, CHANGE, CHANGE! Change these into addition problems: -3 – (-7) and -4 – 2

  5. Let’s practice our “KCC”: -12 + (-6) -14 + 7 5 + (-8) 32 + (-4) -88 + 11 8 + (-10)

  6. Now, let’s solve!: -18 -7 -8 58 -91 23

  7. Word problems: -120 ft. below sea-level.

  8. Word problems: 300 ft. above the ground.

  9. Word problems: The difference is 18⁰ .

  10. Word problems: The difference is 60⁰ .

  11. Word problems: -8⁰F

  12. Word problems: They gained 10 yards (+10).

  13. Word problems:

  14. END OF LESSON The next slides are student copies of the notes for this lesson. These notes were handed out in class and filled-in as the lesson progressed. NOTE: The last slide(s) in any lesson slideshow (entitled “Practice Work”) represent the homework assigned for that day.

  15. Math-7 NOTES DATE: ______/_______/_______ NAME: What: adding and subtracting integers Why: To review the rules for adding and subtracting integers. ADDING INTEGERS (Review): SAME SIGNS DIFFERENT SIGNS _______________ ADD Keep Sign of Larger Absolute Value ______ _______ examples: 3 + 7 = 10 -3 + -7 = ___ -4 + 2 = -2 4 + -2 = ___

  16. Change these into addition problems: -3 – (-7) and -4 – 2 SUBTRACTING INTEGERS: DID YOU KNOW? ALL Subtraction problems are ____________________ problems in disguise! WHY? Because we can re-write every subtraction problem as an addition problem. 8 – 12 = 8 + (- 12) = -4 5 – (-1) = 5 + 1 = 6 KEEP, CHANGE, CHANGE!

  17. Integer word problems:

  18. NAME:________________________________________________________________________________DATE: _____/_____/__________ PRACTICE WORK “Add and subtract integers” Adding Integers: Subtracting Integers (re-write as addition problems first– KCC):

  19. NAME:________________________________________________________________________________DATE: _____/_____/__________ PRACTICE WORK “Integer word problems” • Answer the following problems (SHOW WORK). • Steve is balancing his checkbook for the week. He began the week $15.00 in debt (- $15.00). However, he received two paychecks– one for $128.00 and another for $32.00. He also received two bills– one for $84.00 and another for $66.00. After depositing the checks and paying the bills, how much did Steve end up with? • Claire entered the elevator on the 8thFloor. She rode the elevator down nine levels, up six levels, and down four more levels. What floor did she end up on? • Some divers were 25 ft. below sea level. They ascended 12 ft., descended 32 ft., and ascended 40 feet. Where are the divers now? • It was 10°F on Saturday, but the temperature fell 18° by Sunday. What was the temperature on Sunday? • On a snowy day in Maine, the temperature was 14°F, but the wind-chill factor made it feel like it was -4°F. What is the difference between the real temperature and the wind-chill factor? • Write a story problem that represents the following integer problem: • Your problem could be about sports, money, temp., or • something else of your choosing. -5 – 15 + 30 = _____

More Related