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Video instructions and help with filling out and completing Why Form 8815 Index

Instructions and Help about Why Form 8815 Index

I brought it to prime factors in index form. When I say to express 300 in index form as the product of its prime factors, you've got to divide by prime numbers. So the first thing you're thinking of, more the prime numbers. A prime number is a number that only one and itself go into. So the prime numbers would be 2, 3, 5, 7, 11, 13, 17, 19, etc. There's only one and itself. And what my little tips would be, if it's even, I'm gonna divide by 2. So I'm gonna start by dividing 300 in the middle. And I know because I see even, even means it ends in a 2, 4, 6, 8, or 0. I divided by 2. So what I'm doing is 1/2 of 300. 1/2 of 30 is 15, and I got an extra. So half of 301 is 150, right? That is even as well. So I'll divide that 150 by 2. I'm half of 150. All right, if you don't know how to do that, 2 goes into 150 two good into 15, 7 times, 1 left over. And then 2 into 10 five times. So that becomes 75 fast. Not even, so I can't divide by 2. So what I'm gonna divide by now is 5. You got a choice. You can either add up the digits, 7 plus 5 is 12, because 12 is in the 3 times table. I can divide by 3. So I'm gonna divide it by 3, and I'll do on the side how many threes in 75. How many threes in 7? 2. 3 times 2 equals 6. 1 left over. Only threes in 15. 5. So 3 goes into 75, 25 times. And now, any prime numbers going to 25? She won't...