Integers are simply "whole" numbers such as 0,1,2,3 and so forth (as opposed to 1.5 for instance). To multiply integers we either have to know our times tables or know how to make use of a computer. To know both is preferable.
If, as an absolute minimum, you learn the times tables for all the 10 digits (up to and including times 9 for each one) then you will be able to multiply any two integers (within practical limits). In fact you will be able to multiply any 2 rational numbers. You might need to use a pen and paper but, given enough time, you could do it.
Otherwise, you can use a computer (such as a calculator) to do the work for you. Of course, one should not solely rely on computers and should be able to make calculations, such as these, unaided when required.
The only other piece of information you need to know for the multiplication of integers is that whenever you multiply two numbers with the same sign (i.e. two positive or two negative numbers) the result will be a positive number. Whenever you multiply two numbers with different signs (i.e. a positive and a negative number) the result will be negative.
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When you add, subtract, or multiply integers, you get integers. When you divide one integer by another one, you may or may not get an integer.
Multiply them.
why is it important to know how to multiply
You multiply the first two. Then you multiply the result with the third number. Actually you can multiply in any order.
You multiply or divide integers just as you do whole numbers, except you must keep track of the signs. To multiply or divide signed integers, always multiply or divide the absolute values and use these rules to determine the sign of the answer.When you multiply two integers with the same signs, the result is always positive. Just multiply the absolute values and make the answer positive.Positive x positive = positiveNegative x negative = positiveWhen you multiply two integers with different signs, the result is always negative. Just multiply the absolute values and make the answer negative.Positive x negative = negativeNegative x positive = negative.