Create this Time Line on your own. Separate the two sides, placing a chip in the Negative or Positive box below. Have students remove chips based on lower number and what is left is the answer!
for example -7 + 5....
Students place 7 chips on the negative side and 5 chips on the positive side. After removing 5 chips from each side, they are left with 2 chips on the negative side ! Thus -7+5= -2