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Current time:0:00Total duration:3:39

Video transcript

let's explore what it means to subtract numbers so let's say that I want to figure out what for what four minus three is four minus three so one way to think about this is you start with four objects and so let me just draw four objects so there were I have 1 2 3 & 4 and when I so this is the 4 objects right over here and when I say minus 3 or if I'm going to subtract 3 from the four one way to think about it is I'm going to take three of these four objects away so let's do that so I'm going to take away 1 I'm going to take away 2 and I'm going to take away 3 notice I take oh I took away one two three objects so how many do I have left over well if I start with four and I take away three I subtract three four minus three I am left with I am left with one object right over here so four minus three is equal to is equal to one fascinating let's do another one of these let's figure out what 5 what 5 what 5 minus 2 is let's write it this way let's say we want to figure out something some question mark some question I actually let me just clear this out so I'll just do it right over here actually so let's say we have some question mark so there's some unknown number right over here so I'll just put a question mark over here and we say that unknown number is equal to is equal to 5 5 minus 2 minus 2 minus 2 so what is this going to be well let's visualize this me I have five things and I'm going to take away two of them and this is going to be what I have left over after I start with five and take away two so I have one two three four five things and now I am going to take away two of them so I'm going to take away one and two so I took away one two objects so how many do I have left over well I have left over these these let me just in a different color I have left over these purple things right over here so how many is that how many do I have left over well I have left over one two three of my original five so something is equal to five minus two that something is three three is equal to five minus two so let me just replace this with a three so we see that three let me do the three in the same color as this green so we see that three three is equal to five minus two or we could say that five minus two is equal to three either way