Multiplying two numbers with like signs, either two positive numbers or two negative numbers, yields a positive number. Numbers not preceded by a sign are considered positive. Those numbers preceded by a minus sign, sometimes surrounded by parenthesis, are negative numbers.
Using a number line, the positive symbol refers to facing or moving to the right. The negative symbol is facing or going toward the left. The number sentence 2 X 3 = 6 means face the right and take two steps forward three times. The answers is 6. To demonstrate how a negative times a negative equals a positive, face left and take two steps backward three times. Therefore, (-2) X (-3) = 6.