Learn to divide 7182÷42. There is no remainder. Created by Sal Khan.
Want to join the conversation?
- Is it possible that you could divide a number with 2 digits by a number with 3?(1 vote)
- Quick question, how would you divide a problem that has the divisor greater than the dividend? for example, 24 divided by 50(8 votes)
- kinda off topic but this popped into my mind. if i where to divide two of the same numbers by each other i would get 1 right? because division is multiplication flipped around correct?(12 votes)
- Multiplication is repeated addition. Division is repeated subtraction. So you're sort of right, I guess..?(3 votes)
- quick question. if 2 numbers of the equation still don't come in the times table do you move onto the third?(5 votes)
- It appears that you are asking about things for long-division, dividing by 2-digits. However, know that you will never have to move onto the third. When comparing the first digit of the dividend with the first digit of the divisor, the dividend's may be greater than the divisor's (e.g 91÷9). But once you move onto the next place value, it will always be greater because you are now in the 10's place, and one 10 is always greater than one 9.(2 votes)
- quick question! 36 divided by 6! ;)(4 votes)
- Khan Academy gives the free power of learning and gives you the ability to change the language. I am so grateful for Khan Academy that not only promotes education but gives happiness. I believe if you don't love a subject you won't do well, you need to do it from you're heart. Khan Academy is a game changer and a life saver. Thanks Khan. What could be next?(5 votes)
- And the sheer amount of energy points I get by simply watching a video is crazy. 850 engergy points for watching a video.(4 votes)
- The video looks easy, but when I try to do it in real life by myself, I struggle. So I have been working on it more lately!(3 votes)
- Try it like this- Divide 4000 by 2. You can do that in your head right? So when you do division just keep that close by as an example.(2 votes)
- I wonder when will people realize that when you divide something by 0 you will just get 0.(3 votes)
Let's divide 7,182 by 42. And what's different here is we're now dividing by a two-digit number, not a one-digit number, but the same idea holds. So we say, hey, how many times does 42 go into 7? Well, it doesn't really go into 7 at all, so let's add one more place value. How many times does 42 go into 71? Well, it goes into 71 one time. Just a reminder, whoever's doing the process where you say, hey, 42 goes into 71 one time. But what we're really saying, 42 goes into 7,100 100 times because we're putting this one in the hundreds place. But let's put that on the side for a little bit and focus on the process. So 1 times 42 is 42, and now we subtract. Now, you might be able to do 71 minus 42 in your head, knowing, hey, 72 minus 42 would be 30. So 71 minus 42 would be 29, but we could also do it by regrouping. To regroup, you want to subtract a 2 from a 1. You can't really do that in any traditional way. So let's take a 10 from the 70, so that it becomes a 60, and give that 10 to the ones place, and then that becomes an 11. And so 11 minus 2 is 9, and 6 minus 4 is 2. So you get 29. And we can bring down the next place value. Bring down an 8. And now, this is where the art happens when we're dividing by a multi-digit number right over here. We have to estimate how many times does 42 go into 298. And sometimes it might involve a little bit of trial and error. So you really just kind of have to eyeball it. If you make a mistake, try again. The way you know you make a mistake is, if say it goes into it 9 times, and you do 9 times 42 and you get a number larger than 298, then you overestimated. If you say it goes into it three times, you do 3 times 42, you get some number here. When you subtract, you get something larger than 42, then you also made a mistake, and you have to adjust upwards. Well, let's see if we can eyeball it. So this is roughly 40. This is roughly 300. 40 goes into 300 the same times as 4 goes into the 30, so it's going to be roughly 7. Let's see if that's right. 7 times 2 is 14. 7 times 1 is 28, plus 1 is 29. So I got pretty close. My remainder here-- notice 294 is less than 298. So I'm cool there. And my remainder is less than 42, so I'm cool as well. So now let's add another place value. Let's bring this 2 down. And here we're just asking ourselves, how many times does 42 go into 42? Well, 42 goes into 42 exactly one time. 1 times 42 is 42, and we have no remainder. So this one luckily divided exactly. 42 goes into 7,182 exactly 171 times.