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Current time:0:00Total duration:4:32

Rounding decimals word problems

CCSS.Math:

Video transcript

Joey used 0.43 2 pounds of cheese to make mac and cheese for dinner we could also call this 430 mm pounds of cheese to make mac and cheese for dinner round the amount of cheese to the nearest tenth so the amount of cheese once again is zero point four three two pounds and just remember the places here this is going to be this is 4/10 so that's the tenths place this is the hundredths place and that that's an S there so tenths hundredths and this is right over here is thousands thousands place so we want to round to the nearest tenth so we're going to round to the nearest tenth we go one place to the right if it's 5 or larger we round up this would become a five if it's less than five so it's it's less than five which is the case here we're going to round down to just four tenths even so because 3 is less than 5 we are going to round down and we're going to get zero point four zero zero or we could write that as zero point four or we could write that as four tenths of a pound let's do another one Eliza's pet snail traveled to point one nine seven meters in one day round the distance to the nearest hundredth so pause this video and see if you can do that round 2 the distance to the nearest hundredth so it's two point one nine seven this is the hundredths place right over here and so if we're going to round to the nearest hundredth we're going to go one place to the right if this one place to the right is five or greater we're going to round up and seven is five or greater so we are going to round round up now this is interesting because if you round a nine up you get to ten but you can't put a whole ten right over here so one way to think about is you 19 here and so if you round up you're going to go to a twenty and so or doesn't way to think about it if you round the nine up you're going to go to the next tenth so this is going to be two point we have you could say you could view this as 1900 or 1900s and seven thousand and so now we're going to round up to 20 hundredths so two point two zero we're rounding to the nearest hundredth which you could write is two point two but it'd make it clear that you're rounding to the nearest hundredth you're going to write to point two zero and later in your life this actually might matter to show how much what to actually show what you are rounding to let's do another example here Cassandra spends six point seven five hours each day at school round the amount of time to the nearest hour alright so six point seven five so you might be a little confused and actually I encourage you to pause the video again and try to solve it on your own so you might be a little confused cuz they're not saying round it to the nearest tenth or hundredth or one or ten or hundred they're saying to the nearest hour but in this case the hour is the ones place so if we're going to round to the nearest hour this is another way of saying round to the nearest one so we're going to round to the nearest one we go one place to the right we go to look at the tenths place if it's five or larger we round up well seven is five or larger so we round up to the next hour which is going to be seven so seven hours if this was six point four nine nine nine nine once again if we're rounding to the nearest hour we go one place to the right doesn't matter that we have all these nines here we'd say hey look 4 is less than 5 therefore we should round down round down and you would round down to the next hour well the next hour that's below six point four nine nine nine nine nine nine nine nine is six hours but in this case we had a seven in the tenths place which is definitely greater than or equal to five and so round up to the next hour which is seven hours