If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains ***.kastatic.org** and ***.kasandbox.org** are unblocked.

Main content

Current time:0:00Total duration:4:11

I have here the number 324 which we can view as since I have a 3 in the hundreds place we could say this is three hundreds I have a two in the tens place so we could say plus two tens and then I have a for the ones place so I can say plus four ones and if you want to think about what that looks like you can look at all these blocks here three groups of 100 three groups of hundred one two three two groups of ten two groups of ten I have two groups of ten right over here in yellow for ones I have four ones here so this is 324 blocks so now let's get some practice subtracting from 324 and the first thing I want to subtract from 324 is let's subtract let's subtract a 10 so I want to subtract a 10 here so 10 is 1 10 and 0 on 0 1 so I'm going to do that in the blue color 0 ones so I'm not subtracting any hundreds I am subtracting 1 10 you see it right over there so minus 1 10 and I'm not subtracting any ones so what is that going to get me what is that going to get me well my hundreds don't change I'm not subtracting any 100 so I still have three hundreds so I could write that over here I still have three hundreds I had two tens I'm taking one of them away so now I have 2 minus 1 is 2 minus 1 is 1 10 I had two tens now I take away one 10 I should just call that a 10 instead of a tens I take away one 10 and now I'm going to have and now I'm going to have plus 1/10 if I had to I take away one I'm not going to have one and I had four ones and I'm not taking anyone's away so I still have 4 I still have 4 ones for ones - zero ones four ones so I'm left with 314 300 plus 1/10 four ones and if you look at it over here what did we do we had 324 and then we take away one of the tens so we took away one of the tens and we are left with three hundred 110 and four ones or three hundred and fourteen that was interesting that let's subtract 100 from 324 instead of a 10 so let's now subtract let's now subtract a hundred so that's 100 so I'm not going to subtract 100 and zero tens and zero ones so let's subtract that now what's that going to be well I had three hundreds I take one of them away now I'm going to have two hundreds I had two tens I take away no tens I still have two tens I had four ones I take away zero ones I'm still going to have four ones if you look at it over here what's that going to be let me write an equal sign I had three hundreds I take away one hundred I'm going to have two hundreds I had two tens I'm not taking away any tens so I still have two tens and I had four ones and I'm not taking away any one so I still have four ones and if you think about it in this picture here what did I just do well I took away one group of 100 I took away one group of 100 so I could take away that group of 100 right over there and what am I left with I'm left with two hundreds two hundreds two tens that's the two tens there and four ones to hundreds actually let me write to hundreds let me write it this way to hundreds two tens for one or two hundred and twenty-four