Video: Rounding a Decimal Number to the Nearest Unit

The winner of the 2007 Indianapolis 500, Dario Franchitti, had an average speed of 151.774 miles per hour. Round 151.774 to the nearest ten miles per hour.

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Video Transcript

The winner of the 2007 Indianapolis 500, Dario Franchitti, had an average speed of 151.774 miles per hour. Round 151.774 miles per hour to the nearest ten miles per hour.

We’ve been given this number 151.774 and we need to round it to the nearest 10 miles per hour. Rounding something to the nearest 10 miles per hour means we need to round to the nearest tenth place. The nearest tenth place is here. In order for us to round to the tenth place, we need to look one digit to the right — to the units place.

To the right of our tenth place is a one. If this digit is four or smaller, in our case a one, then we round down and our number in the tenth place stays the same. Our five in the tenth place will stay the same and everything after that becomes a zero like this.

Dario Franchitti averaged 150 miles per hour when you round his average speed to the nearest 10 miles per hour.

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