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Content Standard NS 2.3

Learn how to compare and order fractions and decimals, and solve addition and subtraction problems with integers. Practice using number lines and understanding rules and steps for operations.

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Content Standard NS 2.3

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  1. Content Standard NS 2.3

  2. Homework: pg 138 (16-54 even only)pg 145 (4-26 even only) DO NOW: Compare and order these fractions and decimals. 410 1) 4 20 .60 1 2 .75 .4 2)

  3. Adding and Subtracting Integers! Standard: NS 2.3 Solve addition, subtraction, multiplication, and division problems, including those arising in concrete situations that use positive and negative integers and combinations of these operations. Objective: Students will solve addition and subtraction problems, including those arising in concrete situations that use positive and negative integers by using rules and steps, synthesizing information on positive and negative integers, creating graphic organizers, applying math facts skills, writing reflective summaries, and scoring an 80% proficiency on exit slip quiz.

  4. ObjectivesThe student will be able to: 1. State the coordinate of a point on a number line. 2. Graph integers on a number line. • Add and subtract integers.

  5. The Number Line Integers = {…, -2, -1, 0, 1, 2, …} Whole Numbers = {0, 1, 2, …} Natural Numbers = {1, 2, 3, …} -5 0 5

  6. - 5 0 5 To GRAPH a set of numbers means to locate and mark the points on the number line. Graph {-1, 0, 2}. • • • Be sure to put the dots on the line - not above or below.

  7. Name the set of numbers graphed. {-2, -1, 0, . . . } The darkened arrow means that the graph keeps on going. When you see this, put 3 dots in your set.

  8. 1) (-4) + 8 = Examples: Use the number line if necessary. 4 2) (-1) + (-3) = -4 3) 5 + (-7) = -2

  9. Addition Rule 1) When the signs are the same, ADD and keep the sign. (-2) + (-4) = -6 2) When the signs are different, SUBTRACT and use the sign of the larger number. (-2) + 4 = 2 2 + (-4) = -2

  10. Karaoke Time! Addition Rule: Sung to the tune of “Row, row, row, your boat” Same signs add and keep,different signs subtract,keep the sign of the higher number,then it will be exact! Can your class do different rounds?

  11. Answer Now -1 + 3 = ? • -4 • -2 • 2 • 4

  12. Answer Now -6 + (-3) = ? • -9 • -3 • 3 • 9

  13. The additive inverses(or opposites) of two numbers add to equal zero. -3 Proof: 3 + (-3) = 0 We will use the additive inverses for subtraction problems. Example: The additive inverse of 3 is

  14. What’s the difference between7 - 3 and 7 + (-3) ? 7 - 3 = 4 and 7 + (-3) = 4 The only difference is that 7 - 3 is a subtraction problem and 7 + (-3) is an addition problem. “SUBTRACTING IS THE SAME AS ADDING THE OPPOSITE.” (Keep-change-change)

  15. When subtracting, change the subtraction to adding the opposite (keep-change-change) and then follow your addition rule. Example #1: - 4 - (-7) - 4+ (+7) Diff. Signs --> Subtract and use larger sign. 3 Example #2: - 3 - 7 - 3+ (-7) Same Signs --> Add and keep the sign. -10

  16. Okay, here’s one with a variable! Example #3: 11b - (-2b) 11b+ (+2b) Same Signs --> Add and keep the sign. 13b

  17. Answer Now Which is equivalent to-12 – (-3)? • 12 + 3 • -12 + 3 • -12 - 3 • 12 - 3

  18. Answer Now 7 – (-2) = ? • -9 • -5 • 5 • 9

  19. 1) If the problem is addition, follow your addition rule.2) If the problem is subtraction, change subtraction to adding the opposite (keep-change-change) and then follow the addition rule. Review

  20. Absolute Value of a number is the distance from zero. Distance can NEVER be negative! The symbol is |a|, where a is any number.

  21. Examples 7 = 7 10 = 10 -100 = 100 5 - 8 = -3= 3

  22. Answer Now |7| – |-2| = ? • -9 • -5 • 5 • 9

  23. Answer Now |-4 – (-3)| = ? • -1 • 1 • 7 • Purple

  24. The set of numbers containing all positive and negative whole numbers and zero Integer

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