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Course: Arithmetic (all content)>Unit 1

Lesson 12: Rounding whole numbers

Rounding whole numbers word problems

Sal solves word problems by rounding whole numbers to the nearest ten, hundred, or thousand.

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• I don't understand the second question... why did he go to the tens place?
• In order to round to the hundreds place, you have to look at the tens place to decide whether to round up or down.

If the number in the tens place is between 0 and 4, you round down:
- ones place becomes 0
- tens place becomes 0
- hundreds place stays the same

If the number in the tens place is between 5 and 9, you round up:
- ones place becomes 0
- tens place becomes 0
- hundreds place goes up one

Examples:

3856
- tens place is 5, so round up to 3900

9214
- tens place is 1, so round down to 9200

Just remember that whatever place you are rounding to, you need to look at the number one place to the right to decide whether to round up or round down.

Hope this helps!
• legit i dont under stand like fr
• why do we need to round
• I don't get it on the second question.
• what do you not understand. let me guess. 1,2,3 and 4 round down while 5,6,7,8, and 9 round up. if it rounds to the tens it means you need to look at the ones. rounding to the hundred means you need to depend it on the tens. Anything else I could help you with? :)
• if the number in the hundreds place is lower than five,he rounds down,so that means you round every number below!
• The video is about 3 min i rounded:)
• I don't understand the second question either... why DID he go to the tens?
• Sal went to the tens place because he was rounding to the nearest hundred and he needed to go next door to find the tens place value so that he can determine which way to round.
Let's say you're rounding by the hundreds place and want to find the estimated value of these 2 numbers:
9,128
Well, 9,128 rounds down to 9,100 because it has a 2 in the tens place. Only digits above or are 5 can round up.
7,867
This one rounds up to 7,900 because the tens value is a 6. You remember the rule for this, since it doesn't change no matter what place you're rounding or if trying to determine whether a number rounds up or down.

Hope this helps!
• anything less than five would be rounding down right?
• Anything less than 5 is rounding down, because anything less than 5 would be less than half.
(1 vote)
• Wait…why does 5 round up?
(1 vote)
• Everything below 5 rounds down.
Everything 5 or greater rounds up.