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Oh, dude, it's like, super simple. So, when you divide 15 into 645, you just gotta do the long division thing, you know? You divide 15 into 64, which goes 4 times with a remainder of 4, then bring down the 5, and 15 goes into 45 three times. Boom, you got your answer, like, 43.
To show work for 15 divided by 645, you would set it up as a long division problem. First, you divide 15 into the first digit of 645, which is 6. 15 goes into 6 zero times, so you bring down the next digit, making it 64. Next, you divide 15 into 64, which goes 4 times with a remainder of 4. Then, you bring down the next digit, making it 45. Lastly, you divide 15 into 45, which goes 3 times evenly. Therefore, 15 divided by 645 is 43 with a remainder of 0.
15/645 = 1/43 by dividing the numerator and denominator by their hcf which is 15