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# Rounding by 10 on a Number Line

Ever heard the chant 1 though 4 stay on the floor, 5 though 9 climb the vine?

It is an adorable chant that is perfect for helping our kiddos remember what to do when rounding, but if all they do is recite the rhyme then there is a problem. For students to be successful at anything they have to understand the why, and using number lines while teaching rounding is perfect for just that.

Rounding on a number line, is a very visual way of rounding. It isn’t just learning a rule, but it is seeing it in action.

This rounding pack has numerous activities for helping your children master rounding using a number line.

To begin with, grab their math journals and start the “teaching” portion. If you are teaching in a classroom, I highly recommend pulling small groups to do the teaching part. Have the children glue the interactive notes, step by step instructions,  into their notebook. I love using interactive notes, especially when teaching a method that parents may not be familiar with. Not only do my students have a resource on how to round, the parents have it too.

Anyway, glue it in and begin working through it with your small group. It is very explanatory. Read through the instructions, go over the example given, then let the students give it a try. The reason I like doing these in small groups is so that I can catch any mistakes quickly and my sweet kiddos aren’t practicing it wrong.

The next day, review the notes with your students and then have them do the arrow page. Students cut out the arrows and then solve the problem on the number line. Again, keep a close eye on your little ones so they are not practicing it wrong.

On the third day, there is a game to play. It is a simple set up. Each child needs the game board, five game pieces, and two die. Player one rolls the dice, and decides what he wants his number to be. He rounds that number to the nearest 10 and then moves a game piece to that number. The game is over when all five game pieces are at the end of ALL the number lines.

Finally, you get to pull out the word problem task cards. I would suggest only doing one a day, though you may be able to get in two. I would highly recommend requiring students to create an equation, model (that would be the number line), and then describe how they solved.  When doing this, if force students to slow down and think about the problem and allows you to see who truly understands.

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