Compute $(-49)\div 7$.
I know that division is the inverse of multiplication, so I can think of this problem as finding a number that, when multiplied by 7, gives -49. I can use the fact that 7 times 7 is 49, and that multiplying by a negative sign changes the sign of the product. So, if I multiply 7 by -7, I get -49. Therefore, -7 is the answer. 