## Friday, September 25, 2015

### Rounding Numbers

In Mrs. Essenburg's classroom we are learning to round numbers to the nearest 10 and the nearest 100. We round numbers all the time to make working with numbers easier. Understanding how to round numbers shows we have a good understanding of place value and number sense.

Also, if we can explain what we have learned to others it shows we truly understand what we are learning. Check out the videos below with two students explaining how to round!

Here is Mason W.'s video about rounding to the nearest 10.

Here is Lainie's video about rounding to the nearest 100.

Great job Mason W. and Lainie!

Something else we are working on are Math Practices.

What are Math Practices?

Math Practices describe how we should think and act as mathematicians to have a deep understanding of mathematics. We will be focusing on one or two math practices each day.

For this lesson, we concentrated on the math practice Using Numbers and Words to Help us Make Sense of Problems. It is sometimes easy to find the answer to problems, but it is not as easy to explain why the answer make sense. Check out the great explanations that the third graders gave to the rounding problems below!

Being able to explain our math thinking is a very important skill. It shows we have a good understanding or what we are learning. Great job third-graders!

Third Graders, comment below with a two or three digit number and round it to the nearest 10 or 100. Can you explain your thinking and tell us why you rounded it the way you did?

Parents or visitors to the blog, do you have a rounding problem for us to try? If you do, share it in the comment section below.

Also, it is so important for us to see how we use math in every day life. Can you think of an example of when you might use rounding in your job or during your day? If you can, comment below with an example!

1. Dear class,
My number is 658.I am going to round it to the nearest 100
658 rounded to the nearest 100 is 700
i rounded it to 700 because 700 hundred is closer to 658 (Shiloh)

1. Dear Shiloh,

Good job! It helps me to think of counting by hundreds and then thinking about a number line when I round. That helps me decide which hundred it is closest to.

2. Dear class
My number is 750. I am going to the nearest 100. 750 rounded to the nearest 100 is 800. I rounded it to 800 because 800 is the closest to 750.

1. Dear Lauren!

What a good example! 750 is halfway between 700 and 800 so we could go either way. However we learned that when we round numbers when we are exactly between two hundreds (or two tens) we round to the higher hundred or ten. Thanks for giving us an example of what we do when we have a number exactly in between!

3. Dear Class,

My number is 69. I am going to round it to the nearest 10. 69 rounded to the nearest 10 is 70. I rounded it to 70 because I know if 69 has a 9 it rounds to the higher ten

4. Dear class,
my number is 568 I am going to round it to the the nearest hundred. 568 rounded to the nearest hundred is 600.
I rounded it to the nearest hundred because the tens where over 50 which rounds to 600 if it was like 568 or any number the tens over 50.

5. Dear class,
My number is 88 I am going to round it to the nearest ten is 90 because It's past the middle and there is 1 more
in front.

6. Dear Class,
My number is 76. I am going to round it to the nearest 10.76 rounded to the nearest 10 is 80.i rounded it to 80 because I had 76 and its closer to 80.
omar

7. Dear Class,
My number is 582. I am going to round to the nearest 100. 582 rounded to the nearest 100 is 600. I rounded it to 600 because 600 is closest to 582.

8. Dear class,
My number is 19. 19 rounded to the nearest hundred is 0. It is 0 because if you look at it on a number it is closer to 0 than 100. Lainie

9. Hi class! I use rounding when I am grocery shopping. I round prices to the nearest dollar so I can add as I go and keep track of how much money I'm spending!
Dorothys Mom

10. Dear Jen

What a great example of when we use rounding. I use rounding when I go shopping as well. Otherwise I can end up spending more money than I planned! Also, with Christmas shopping coming up I round when I am shopping for presents.

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