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Adding and Subtracting Integers CCSS.6.NS. 5, 6, 7, 8: Apply and extend previous understanding of numbers to the system of rational numbers. Materials: pencil, journal, glue your quiz into your Journal and head a clean page. Please write your name on the Arctic Lights, Arctic Nights WS and place it in a neat pile in the middle of each group. I will be collecting it for a grade. Then copy your Agenda for the week.
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Rules for Adding and Subtracting Integers https://www.youtube.com/watch?v=6EWq9EZmIKg https://www.youtube.com/watch?v=6EWq9EZmIKg ADDING INTEGERS WITH THE SAME SIGN: Add the absolute values and use the common sign. 1. Ex. 10 + 14 = 24 2. Ex. -7 + (-5) = -12 ADDING INTEGERS WITH A DIFFERENT SIGN: Subtract the lesser absolute value from the greater absolute value and use the sign of the integer with the greater absolute value. 1. Ex. 13 + (-9) = 4 2. Ex. -11 + 6 = -5 OPPOSITES: The sum of an integer and its opposite is zero. 1. Ex. -4 + 4 = 0
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Let’s try it out! 1. -8 + (-2) 2. 8 + 2 3. -9 + 5 4. 4 + (-15) 5. 12 + (-3) + 13 + (-5)
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Rules for Adding and Subtracting Integers TO SUBTRACT AN INTEGER ADD ITS OPPOSITE, then apply adding integers rules. 1. Numbers Ex. 5 – 7 = 5 + (-7) 2. Algebra Ex. a – b = a + (-b)
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Let’s try it out! Remember…to subtract an integer, add its opposite and then use the rules for adding integers. 1. 2 – 7 2. - 6 – 8 3. 12 – (-9) 4. -10 – (-5) https://www.youtube.com/watch?v=q2IW9FolSnc
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Human-Interactive Number Line Start at zero. Move to the first number in the number sentence. Then, if adding face to the right. If the addend is positive, move forward. If it is negative, back up. Start at zero. Move to the first number in the number sentence. Then, if subtracting face to the left. If the subtrahend is positive, move forward. If it is negative, back up. Try it! 8 + (-3)8 + 3-8 + 3-8 + (-3) - 8 – (-3)8 – 3-8 – 3-8 – (-3) Does this always work? Let’s test it with a group activity. How can you use this process with a pencil and paper number line?
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Homework Watch the National Championship game and root for the Oregon Ducks!!
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