Monday, September 16, 2013

Revved Up For Rounding!

In math, our class has been working on ROUNDING!

It can be a tricky skill, so Frogger has a 
few tips and rules to help!

Frogger's Radical Rounding Rules!

                  1. Underline the place value position to which you are rounding.
                    2. Draw an arrow to the neighbor on the right.
3. Write which two tens or two hundreds the number is between.
4. If the neighbor next door is 5 or more, round up, round up!
                    5. If it's not, round down!
6. Circle the correct estimate/answer.

Remember, we call numbers round because they end with zero!

Example: Round 74 to the nearest 10

  • 74 is between 70 and 80
  • The digit next door to the tens place is 4, so round down to 70
Answer: 70
(74 gets "rounded down")

Example: Round 86 to the nearest 10

  • 86 is between 80 and 90
  • The digit next door to the tens place is 6, so round up to 90
Answer: 90
(86 gets "rounded up")


Here are some great examples from our recent practice in class:

Nearest ten

Nearest hundred


Nearest thousand

Watch the slide show and try the quiz to practice 
your rounding skills!

Rounding Numbers! on PhotoPeach

You can also head over to IXL for more practice!

How did you do on the rounding quiz?

How about asking a rounding question
 in your comment?

Once others write comments, look for question you can answer!


  1. Dear Class,
    Rounding is fun! I tried the quiz and did pretty good. If you have not given it a shot, I recommend it.



  2. Dear Class,

    What is the answer to 78,965 rounded to the nearest ten thousand?

    What is the answer to 673 rounded to the nearest ten?

    What is the answer to 8,937 rounded to the nearest ten?


    1. @Lucas,

      Thanks for your challenging problems!

      The answer to the first on is 80,000.

      In the second problem, the two tens that 673 is between are 670 and 680. We know we're going to round down, so the answer to the second one is 670!

      In the last problem,8,937 is between 8,930 and 8,940, and we will round up,so the answer is....

      Are we correct?
      Lucas, here's one for you to solve:

      What is 375,982 rounded to the nearest hundred thousand and also to the nearest ten thousand?!

      Your math-loving class,
      Mrs. Ranney's Class

  3. Dear class,

    I have a problem for you. What is the answer to 10,999,999 rounded to the nearest ten million? I have another problem for you, what is the answer to 99,999,999 rounded to the nearest ten? I wonder who can get both problems right!

    Your classmate,

  4. Dear Mrs. Ranney and Class,

    I am so thrilled with the way that you are learning rounding. What a great way to write down both rounding choices and then circle the correct answer. I am learning a lot by watching Kim do her homework. Way to go Mrs. Ranney and team. Good luck on your tests tomorrow.


    Kim's Mom

  5. Dear Mrs.Ranney and Class,

    You are correct.

    I know I'm going to round up because of the seven in the ten thousand place. The answer to the question is 400,000.

    I'm going to round up because of the five in the thousands place and the answer to the other question is 380,000.

    It was not sheer luck that I answered the questions.

    I love math even though questions are like boulders sometimes, because sometimes they are hard to answer just like boulders are hard to move.

    I want this to be a HUGE post.


  6. Dear Mrs.Ranney and Class,

    I just did the rounding quiz and I l♥ved it! Doing math problems could be hard like when you're trying to climb a canyon with boulders falling.I cant wait to do the math test tomorrow because I l♥ve rounding! I hope everyone gets a good grade on their math test! If you ever go on a camping trip be careful of ledges See you tomorrow!!!
    From your friend


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