To find out how many stamps Mahalia has left after giving 7 stamps to her mom from a sheet of 11 stamps, we need to determine the subtraction involved:
11 (total stamps) - 7 (stamps given to her mom) = 4 (stamps left).
The addition fact that corresponds to this subtraction is:
7 + 4 = 11.
So, the correct response is 7 + 4 = 11.