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CCSS.Math: , ,

so i'm going to write down a number and i'm going to think about how much do each of these digits of the number what value do they represent and actually let me pick on this 2 here what does that 2 represent does it just represent two or does it represent something different than just two pause the video and think about that all right now think about it together and actually i'm going to start with the 7 here the 7 is in the ones place so this seven represents seven ones which is of course still just seven so nothing too surprising there then we could go to the tens place so this one doesn't just represent one it represents one 10 or another way to think about it it represents 10 and then this 2 it is in the hundreds place so it doesn't just represent 2 it represents 2 hundreds we could write it that way or it represents the value 200. so the number here is 217. the 2 represents 200s or 200. now let me give you a slightly different question i'm going to write down three numbers so we have this number and i'm intentionally not saying it out loud that number i have this number and i have this number and what i want you to do is pause the video and tell me in which of these three numbers does the 7 represent 70 pause the video and think about that all right now let's work through this together so let's start with this top number this in this number the seven is in the ones place so that seven really just represents seven ones which is still just seven so this seven does not represent 7t now in this next number the 2 is in the ones place and we see that the 7 is in the tens place so this actually represents 7 tens well 7 tens is the same thing as 70. so it's actually in this second situation where the 7 does represent 70. this number is 572 the 7 represents 70. and let's just check this last number here well here the 7 is not in the ones place not in the tens place it is in the hundreds place so this represents 7 hundreds or 700 and that makes sense this number here is 705.