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Adding and Subtracting

Adding and Subtracting. 4 + 6 – 3 – 9 We can think of this as: =(+4) + (+6) + (-3) + (-9) We would then group positives, and the negatives with like terms. =(+10) + (-12) =-2. Example #1. -3 + 8 – 7 – 5 + 12 This means: (-3) + (+8) + (-7) + (-5) + (+12) Group positives and negatives.

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Adding and Subtracting

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  1. Adding and Subtracting

  2. 4 + 6 – 3 – 9 • We can think of this as: • =(+4) + (+6) + (-3) + (-9) • We would then group positives, and the negatives with like terms. • =(+10) + (-12) • =-2 Example #1

  3. -3 + 8 – 7 – 5 + 12 • This means: • (-3) + (+8) + (-7) + (-5) + (+12) • Group positives and negatives. • =(+8) + (+12) + (-3) + (-7) + (-5) • =(+20) + (-15) • =(+20) – (+15) (optional) • =+5 Example #2

  4. The Toronto Argonauts took possession of the football on their own 25 yard line. On their first play the threw the ball for a gain of 11 yards. On the next play they ran the ball but lost 2 yards. On the next play they were penalized 5 yards for going offside. They then ran the ball again for a gain of 25 yards. At what yard line are they now? Word Example

  5. 25 + 11 – 2 – 5 + 25 • = 25 + 11 + 25 – 2 – 5 • = 61 – 7 • = 54 • They are on their own 54 yard line.

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