Oh, dude, that's like basic math 101. So, 18 goes into 81 four times. You just divide 81 by 18 and boom, you got your answer. Math, man, it's like magic but with numbers.
To determine how many times 18 goes into 81, you would divide 81 by 18. The quotient of this division is 4 with no remainder. Therefore, 18 goes into 81 exactly 4 times.
Well, isn't that a happy little math question! If you take 81 and divide it by 18, you'll find that it goes in 4 times. Remember, there are no mistakes in math, just happy little accidents.