A negative number divided by a negative number always yields a positive number. For instance, -4 / -2 = 2. In other words, there are two -2s in -4.
Likewise, two negative numbers multiplied together always yield a positive number. For example, -2 x -2 = 4. Two positive numbers multiplied together are also positive, as is a positive number divided by a positive number.
A positive number multiplied by a negative number is always negative. For instance, -2 x 2 = -4. Negative numbers divided by positive numbers and positive numbers divided by negative numbers are always negative. For example, -4 / 2 = -2, and 4 / -2 = -2.