How To Solve A Long Division Problem

How To Solve A Long Division Problem-54
This whole column right here, that's the tens column. And then there is-- and I don't want to make this look like a-- I don't want to make this look like a-- Let me clean this up a little bit. We just said that 4 goes into 344 eighty times, right?

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And all we really need to know to be able to do these, to tackle these, is our multiplication tables up to maybe 10 times 10 or 12 times 12.

So hopefully, that gives you the hang of how to do these larger division problems.

That's-- We subtract at that stage, either case.

Or if you divided them into groups of 86, you would get 4 groups.

Let me draw a line here so we don't get confused.

And there's going to be a little bit left over. Since we're doing the whole 60, we put the 7 above the ones place in the 60, which is the tens place in the whole thing.

And then you say 7 goes into 21-- Well you know that.

And I won't take that little break to explain the places and all of that. I want, at least, you to get the process down really really well in this video.

But the quick way to do is just to think about, well 5 times what is 25, right? And if you know your multiplication tables, especially your 5-multiplication tables, you know that 5 times 5 is equal to 25. And if you know your multiplication tables, you know that 7 times 7 is equal to 49. Once again, you need to know your multiplication tables to do this. And sometimes, even if you don't have it memorized, you could say 9 times 5 is 45. And, immediately when you see that you might say, hey Sal, I know up to 4 times 10 or 4 times 12. And what I'm going to show you right now is a way of doing this just knowing your 4-multiplication tables.

So something like this, you'll immediately just be able to say, because of your knowledge of multiplication, that 5 goes into 25 five times. Not over the 2, because you still want to be careful of the place notation. It goes into it 5 ones times, or exactly five times. All the examples I've done so far is a number multiplied by itself. And 9 times 6 would be 9 more than that, so that would be 54. So just as a starting point, you need to have your multiplication tables from 1 times 1 all the way up the 10 times 10 memorized. So what you do is you say 4 goes into this 3 how many times? But 4 goes into 3 no hundred times, or 4 goes into-- I guess the best way to think of it --4 goes 3 0 times.

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