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Current time:0:00Total duration:1:53

Adding 2-digit numbers without regrouping 1

Video transcript

try to pause the video and figure out what 71 plus 24 is alright now let's do this together so let's think about what 71 actually means well we have a 1 in the ones place let me make this clear so this is the ones place and so we have 1 1 and so that's that 1 1 right over there and then in the tens place in the tens place we have 7 and so we have seven groups of 10 one two three four five six seven groups of ten so this this really means seven tens and one one this right over here is 71 boxes and we're going to add to that two tens we're going to add to that two tens you see them here 110 two tens and four ones and four ones so what is that going to be well let's first think about let's think first thing let's think about the ones we have one one and then four more ones well that's going to be five ones that's going to be five ones so we can count them right over there that is five ones right over there one one plus four ones is five ones and then when you look at the tens seven tens plus two tens well if you combine all of these together if you combine all of these together you are going to have nine of these groups of ten you're going to have nine tens seven tens plus two tens is nine tens so we're left with nine tens which we see right over here and five ones and five ones well what's another way of saying nine tens and five ones well that's ninety five and we're done