## Subtracting a number is the same as adding its opposite. Example: -13 – 7 = -13 + (- 7) = -20 Example: 17- 8 = 17 + (-8) = 12 Example: -13 – (- 7) = -13 + 7 = -6 Example: 17 – (-8) = 17 + 8 = 25 Example: 67 – (- 45) = 67 + 45 = 112 Example: -17 – (-30) = -17 + 8 = -13

 Mavis Marble uses her new Mitra Card ( the card that does the math for you ) to buy material and yarn. She has been using it for 4 months. She just got a letter in the mail saying her account is now at -355. "This can't be. My card says I have a credit of \$240." Mavis will need to compare her Mitra card charges with her payments. Find the correct balance for her Mitra account.

 Mitra Charges Payments Balance -80 sewing material -(-60) 60 -120 sewing material -(-60) 120 -60 sewing material -(-60) 180 -95 sewing material -(-60) 240

 Find the difference and input the correct balance.

Alpha | Go on to the Interactive Activity at the Red Box Division

 writer: Kevin Gallagher/mC
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