Learn about Multiplication of Integers In this lesson, let’s learn about a couple of quick tips about multiplication of integers. We will try two problems. The first one wants us to multiply the integers (-3) x 4. Let’s do that first. So we’re multiplying -3 with 4. The key to remember is how do we tackle signs. The key to signs is both integers have a positive sign then the net result is positive. If one of them has a negative sign like this then the result at negative and if both have negatives then the result is positive. So another way to look at it is if both integers that are being multiplied or any two numbers that are being multiplied if they have different signs then the answer is always a negative sign. So let’s remember that. So (-3) x 4, 3 times 4 is 12 and since one has got negative, one has got positive the answer will be a negative. The second problem is p x q when p = -3 and q = -4. So we’re given p = -3 and q = -4. That’s what we’re given. So if that’s what the numbers are let’s substitute the values so this becomes -3 x -4, -3 x -4 is 12 and negative and negative is positive. The reason it is positive is because both of them have a positive sign. If two positives then it’s a positive, two negatives it’s a positive. So the key thing to remember is multiplying two integers that have different signs gives us the negative integer and if both have the same signs, negative or positive, we get a positive number.