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1.06 Rounding numbers to 100's

Lesson

Are you ready?

We've seen how to round numbers to $10$10's. Understanding how to do this will help us with rounding to $100$100's. 

Round $54$54 to the nearest ten.

Learn

Sometimes we may need to solve problems by estimating. We can see if our number is closer to the hundred before it, or after it. Let's see how we round our number to the nearest hundred.

Apply

Question 1

The number $313$313 is plotted on the number line.

050100150200250300350400

  1. Round $313$313 to the nearest $100$100 and plot it on the blank number line.

    050100150200250300350400

Question 2

Round $370$370 to the nearest hundred.

 

Remember!
  • If you are rounding a number to the nearest $100$100, think about whether it is closer to the one above, or the one below.
  • If a number is exactly in the middle, round to the higher number.
  • This is the same as it was for rounding to the nearest $10$10, but one place value higher.

Outcomes

3.NBT.A.1

Round whole numbers to the nearest 10 or 100 using understanding of place value and use a number line to explain how the number was rounded

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