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Video transcript

out some strategies subtracting decimals that involve hundredths so for example if I have zero point six nine or 69 hundredths and from that I want to subtract zero point three four or thirty four hundredths what is that going to be pause this video and see if you can compute this so there's a bunch of ways to think about it one way to think about it is this is sixty nine hundreds hundreds and from that we are subtracting thirty four hundred under its and so this boils down to have 69 of something in this case hundredths in this case hundreds I'm going to take away thirty four of them so what am I left with well what's 69 minus 34 well nine ones minus thirty or I should say nine minus four is going to be five and sixty minus 30 is going to be thirty so I'm left with 35 hundredths hundredths which I can write as 0.35 now another way I could think about it is I could break up the tents the end then the leftover hundreds so I could view this as six tenths we can circle that a little bit better six tenths minus 3/10 so six tenths minus three minus three tenths plus plus plus nine hundredths minus four hundredths so plus nine hundredths minus four hundredths and we're going to get the same answer so that's 6/10 when I take away three of them that's going to give me three tenths or I could just write that as zero point three and then to that I would have to add nine nine hundredths minus four hundredths is five hundredths so 0.05 so three tenths and five hundred is going to be 35 hundredths or we could just write it this way we could write it as 3/10 we have a 3 in the tenths place and 5 hundredths let me do that blue color and 5 hundredths or we could do that as 35 hundredths however way these are different ways of thinking about subtracting these hundredths let's do let's do another example so let's say we want to compute so we would like to compute and this actually will probably a little bit more straightforward three and forty three hundredths minus two what is this going to be equal to pause the video and see if you can figure it out well it might jump out at you that this is the same thing as three plus forty three hundredths minus two and so you can just look at the ones you can look at the holes we have three holes and we're going to take away two of them so we're gonna be left with one hole and we still have this forty-three hundredths so we still have this forty three hundred so it's going to be one and forty-three hundredths or we could write that as 1 point 1 point 4 3 so that one maybe was a little bit more straightforward but I always kind of combine the ideas of these last two examples it's one that might seem a little bit more daunting so let's say that we want to subtract we want to figure out what 65 point seven nine minus forty two point five eight is pause the video and see if you can figure this out so multiple ways to do this you could separate the whole numbers so you could say this is 65-42 65-42 plus and then think about the and then think about the hundredths plus seventy nine hundredths so seventy nine hundredths minus 58 hundredths minus 58 hundredths and I just I'll rewrite this in just to reinforce it 79 of something 79 hundreds you could say it's seven ten to nine hundredths but it's the same thing as seventy nine hundredths hundredths this is fifty eight hundreds hundreds and so 65-42 5-2 though on the ones we're going to get three and then 60 minus 40 is equal to 20 so we have 23 plus 23 plus now seventy-nine hundreds - 5870 minus 50 is 20 and 9 minus 8 is 1 so it's going to be 21 hundredths which we can write as zero point 2 1 21 hundreds and so when we compute this it'll be 23 and 21 and 21 hundredths it's just one way to tackle it there are multiple ways that you could try to tackle a subtraction problem like this