Lesson 2.3 Subtracting Integers View in “Slide Show” mode.

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Lesson 2.3 Subtracting Integers View in “Slide Show” mode

Add the Opposite! Addition and subtraction are inverse operations – They “undo” each other. Instead of subtracting a number, you can add its opposite How about we “add the opposite” Great Idea!

Add the Opposite -2 - (- 4) -2 + ( + 4) Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned.

Add the Opposite -2 + ( + 4) Different signs, so find the difference (-,+) Think: 4 – 2 = 2 Use the sign of the number with the greatest absolute value (positive 4) Answer: +2 or 2

Add the Opposite! Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned. This one is easy! 3 – 2 = ?

Add the Opposite Different signs, so find the difference (+,-) Think: 3 – 2 = 1 Use the sign of the number with the greatest absolute value (positive 3) Answer: +1 or 1

Add the Opposite! Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned.

Add the Opposite Same signs, so find the sum (-,-) Think: = 6 Use the same sign of the integers (negative) Answer: -6

Add the Opposite! -4 - (- 2) -4 + ( + 2) Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned.

Add the Opposite -4 + ( + 2) Different signs, so find the difference (-,+) Think: 4 – 2 = 2 Use the sign of the number with the greatest absolute value (positive 4) Answer: -2

Add the Opposite! 5 - (-2) 5 + ( + 2) Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned.

Add the Opposite 5 + ( + 2) Same signs, so find the sum (+,+) Think: = 7 Use the same sign of the integers (positive) Answer: +7 or 7

Add the Opposite! Change the subtraction sign to a + sign Change the next integer sign to its opposite Use the addition rules you’ve already learned.

Add the Opposite! Same signs, so find the sum (-,-) What is the answer? -10

Add the Opposite! -1 - (- 8) You try it -1 + (+ 8) Answer: +7 or 7

Add the Opposite! -2 - (- 6) You try it -2 + (+ 6) Answer: +4 or 4

Evaluate x - y X = -3 and y = 2 You try it Answer: -5

Evaluate x - y X = 4 and y = Answer: 10

Find the difference between 32°F and -10°F 32 - (- 10) °F

Find the difference between 8°F and -5°F 8 - (-5) 8 + (+5) 13 13°F