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:2:21

I would like you to pause the video and think about what 64 - 31 is alright now let's let's think about this together so what does 64 actually mean well we can use place value to think about that the six is in the tens place and the four is in the ones place so the six over here that means six tens it means six groups of ten and so we can visualize that right over here six tens one two three four five six groups of ten or another way to think about it six tens this is these are 16 boxes right over here in groups of 10 and then we have four ones well this is for this is for one's right over here for ones so this is 64 six tens four ones altogether I have 64 boxes 60 of these blue ones and I have four ones four of these individual ones now I want to take away 31 well what is 31 31 is three tens and one one so let's first take away the one one we're going to take this away we're subtracting we're subtracting three tens and we're subtracting one one so let's select with well now we're left with three ones so for four ones minus one one is three ones now let's think about now let's think about the tens so I had six tens I'm going to take away three of them I'm going to take away three of the tens so let's do that let's take away that's 110 taking one ten two tens and then three tens and so what am I going to have left over well I'm going to have left over just three tens just these three these three right over here so six tens minus 3/10 is three tens and so 64 minus 31 is 33 three tens and three ones three tens this is a group of 10 another group another group of ten three tens and then three ones one two three