Rounding whole numbers to nearest ten
Narrator says rounding up 'would go to 1,500' and rounding down 'would go to 1,500... round down to 80', a slip while colour-coding; the intended choices are 1,580 and 1,590. Also refers to 'the last two examples' not in this video.
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The video rounds 1,585 to the nearest ten. It looks at the tens digit, names the two choices (1,580 or 1,590), and uses the rule that if the digit to the right is 5 or greater you round up, giving 1,590.
You'll be able to
- find the tens place in a four-digit number.
- name the two tens a number lies between.
- round a number to the nearest ten using the 5-or-greater rule.
Key words
- round
- To change a number to a nearby, simpler number that is close in value.
- tens place
- The digit second from the right in a whole number; it tells how many tens there are.
- round up
- Move to the next higher ten, for example 1,585 becomes 1,590.
- round down
- Keep the same tens digit and change the ones to 0, for example 1,584 becomes 1,580.
Transcript
Round 1,585 to the nearest ten. Let me rewrite the number. 1,585 to the nearest ten. So we want to focus on the tens place. If we were to round it up, we would go to 1,500-- let me color code it. We would round up to 1,590. The 8 would round up to a 9. And 90, if we were to round down, we would go to 1,500, and we would round down to 80.
So these are our two choices. Now we've seen the last two examples. If the place to the right of it is 5 or greater, we round up. Well, the place to the right of it is definitely 5 or greater. It is 5, so we round up. So it is 1,590. And we're done!
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