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what I want to do in this video is think a little bit about what numbers really represent so let's say someone were to write down the number 25 so what does this really mean well the five here this is in the ones place so it literally represents five ones and this two right over here this is in the tens place this is in the tens place so let me write that down that's the tens place that's the ones place so this represents two tens what do I mean by that well another way to write this is this - this says this represents two tens so let me write that down this is equal to two two tens plus plus 5 ones plus five ones now what are two tens well that's literally if you could imagine a ten being a block of ten things so you could imagine if this is a ten right over here let me copy and paste this so copy so this is going to be the same thing this is going to be equal to you have your two tens so 110 and two tens so you have your two tens so that's your two tens right over there that really represents 20 plus your five ones plus plus your five ones well if this is a one right over here and I'm just representing it as kind of one vertical bar five ones are going to look like we're going to have one two - I think you see where this is going three four four and five and five and so these are all different ways of representing the same quantity 25 is two tens and five ones this is this two is in the tens place the five is in the ones place so two tens plus five ones so you could view this as two groups of ten plus five groups of or five ones right over here and what is this going to be the same thing as well two groups of ten this is the same thing as 20 and this over here is equal to five so once again all ways to represent 25 you could view this as two tens plus five ones or you could view this you could view this as twenty let me write this down 25 you could view because this two is two tens that represents 20 plus the five ones plus five ones