What is the sum of all the integers between -12.1 and 3.3?

-8.8

The integers between -12.1 and 3.3 are -12 to 3.

We can add the negatives and the positives separately.

1+2+3 is 6.

1+2+3+4+5+6+7+8+9+10+11+12 is 78, so the negatives would equal -78.

-78+6 is -72.