Subtracting a number is the same as adding its opposite.

 

Example: -13 – 7 = -13 + (- 7) = -20

 

Example: 17- 8 = 17 + (-8) = 9

Example: -13 – (- 7) = -13 + 7 = -6

 

Example: 17 – (-8) = 17 + 8 = 25

 

Example: 67 – (- 45) = 67 + 45 = 112

 

Example: -17 – (-30) = -17 + 30 = 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.

Hint: Your starting balance is zero.

MITRA CHARGES

-80 Sewing Material

-120 Sewing Material

-60 Sewing Material

-95 Sewing Material

PAYMENTS

-(-60)

-(-60)

-(-60) 

-(-60) 
Find the difference and input the correct balance.

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