because you must, in order to do the inverse operation of multiplication you must perform division. division makes the numbers smaller which is very important in certain equations and word problems.
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You divide by the number of numbers - if you want the mean of three numbers you divide by 3, if you want the mean of a hundred numbers you divide by 100.
you right the numbers and divide
nothing divide in to five
You have to add those two numbers then divide them by 2. The reason you divide by 2 is because they're two numbers.
Just divide the numbers, and the answer will have no measurement units.