Look! we're taking 10 from the 30 that becomes a 20 and then the 1 becomes an 11 the way when I was first in school people'd say, "You borrow one from the three" and you kind of just stick that one right over here but what you're really doing is you're taking a 10 from a 30 and making it into a twenty and you're getting a- you're adding the ten to the one getting 11 but either way you'll end up with 11 in the ones place and now you can subtract 11 - 6 is 5 now we go over to the tens place in the tens place we now have 2-7 which is really representing 20-70 well we - thats 70 is bigger than the 20 so we want to add some more to the tens place well we can go the hundreds place to find some more value to regroup so let's see if we can do that we have 500 here so what happens when we take a hundred from that so we're just left with 400 from here and we take that 100 and we put it in the tens place so instead of 20 we now have 120 if you look at it on this problem since we are using the places here we're going to take 100 from the 500 and have 400 and then we're going to take that 100 that we took and take it to the tens place well 100 is 10 tens so we're going to add 10 to this so this is going to become a 12 once again, the way- the kind of more mechanical rope way of thinking about it is that