Rounding to the nearest 100 | 3rd grade | Khan Academy | Summary and Q&A

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October 4, 2013
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Khan Academy
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Rounding to the nearest 100 | 3rd grade | Khan Academy

TL;DR

Learn how to round numbers to the nearest 100 by examining the tens place and applying the rule.

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Questions & Answers

Q: How do you round a number to the nearest 100?

To round a number to the nearest 100, examine the tens place digit. If it is 5 or larger, round up to the next multiple of 100. If it is less than 5, round down to the previous multiple of 100.

Q: Why is it important to consider the tens place when rounding to the nearest 100?

The tens place determines whether a number is closer to the multiple of 100 above or below it. By looking at the value of the tens place, you can determine the correct direction to round.

Q: How would you round 245 to the nearest 100?

When rounding 245 to the nearest 100, the tens place is 4. Since it is less than 5, we round down. Therefore, 245 would be rounded down to 200.

Q: What is the rule for rounding to the nearest 100?

The rule for rounding to the nearest 100 states that if the value in the tens place is 5 or larger, round up; if it is less than 5, round down. Apply this rule to determine the appropriate multiple of 100.

Summary & Key Takeaways

  • Understand the process of rounding numbers to the nearest 100 by considering the multiples of 100 on a number line.

  • Examine examples of rounding 152, 137, 245, and 354 to the nearest 100 using the rule of looking at the tens place.

  • Learn how to decide whether to round up or round down based on the value of the digit in the tens place.

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