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- [Instructor] Joey used[br]0.432 pounds of cheese

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to make mac-and-cheese for dinner,

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and we could also call this[br]432/1,000 pounds of cheese

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to make mac-and-cheese for dinner.

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Round the amount of cheese

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to the nearest tenth.

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So the amount of cheese once again

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is 0.432 pounds

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and just remember the places here.

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This is 4/10,

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so that's the tenths place.

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This is the hundredths place,

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and that's an S there,

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so tenths, hundredths,

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and this right over here is thousandths,

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thousandths place.

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So we wanna round to the nearest tenth.

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So we're gonna round to the nearest tenth.

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We go one place to the right.

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If it's five or larger,

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we round up.

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This would become a five.

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If it's less than five,

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well, if it's less than five,

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which is the case here,

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we're gonna round down to just 4/10 even.

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So because three is less than five,

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we are going to round down,

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and we're going to get 0.400,

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or we could write that as 0.4,

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or we could write that as 4/10 of a pound.

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Let's do another one.

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Eliza's pet snail traveled[br]2.197 meters in one day.

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Round the distance to[br]the nearest hundredth.

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So pause this video and[br]see if you can do that.

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Round the distance to[br]the nearest hundredth.

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So it's 2.197.

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This is the hundredths[br]place right over here,

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and so if we're gonna round[br]to the nearest hundredth,

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we're gonna go one place to the right.

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If this one place to the right

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is five or greater,

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we're gonna round up,

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and seven is five or greater,

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so we are going to round up .

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Now this is interesting

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'cause if you round a nine up,

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you get to 10,

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but you can't put a[br]whole 10 right over here.

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So one way to think about it

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is you have a 19 here,

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and so if you round up,

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you're gonna go to a 20,

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or another way to think about it.

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If you round the nine up,

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you're gonna go to the next tenth.

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So this is going to be 2 point,

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you could view this as 19/100

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or 19/100 and 7/1,000,

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and so now we're gonna round up

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to 20/100,

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so 2.20.

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We're rounding to the nearest hundredth,

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which you could write as 2.2,

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but to make it clear

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that you're rounding to[br]the nearest hundredth,

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you're gonna write 2.20,

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and later in your life,

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this actually might matter

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to actually show what you're rounding to.

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Let's do another example here.

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Cassandra spends 6.75[br]hours each day at school.

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Round the amount of time[br]to the nearest hour.

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Alright, so 6.75,

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so you might be a little confused,

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and actually, I encourage[br]you to pause the video again

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and try to solve it on your own.

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So you might be a little confused

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'cause they're not saying[br]round it to the nearest tenth

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or hundredth or one or 10 or 100.

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They're saying to the nearest hour,

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but in this case,

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the hour is the ones place.

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So if we're gonna round[br]to the nearest hour,

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this is another way of saying

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round to the nearest one.

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So we're gonna round to the nearest one.

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We go one place to the right.

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We go to look at the tenths place.

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If it's five or larger,

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we round up.

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Well, seven is five or larger,

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so we round up to the next hour,

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which is going to be seven,

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so seven hours.

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If this was 6.49999,

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once again, if we're[br]rounding to the nearest hour,

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we go one place to the right.

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It doesn't matter that we[br]have all these nines here.

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We'd say, hey, look,[br]four is less than five.

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Therefore, we should round down,

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round down,

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and you would round down to the next hour.

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Well, the next hour that's below 6.499999,

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nine, nine, nine, nine,

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is six hours,

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but in this case, we had a[br]seven in the tenths place,

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which is definitely greater[br]than or equal to five,

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and so we'd round up to the next hour,

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which is seven hours.