Many of my students were making careless mistakes when adding or subtracting whole numbers and decimals. They know about place value. They know how to set up a whole number as a decimal. However, I think they get "caught up in the moment" when solving a problem and just rush through it. I don't know if you are aware of this, but, some students just don't like math and their goal is usually to hurry up and finish their work so that they can do something else. (Insert sarcasm here.)

I've tried several strategies, such as having them write whole numbers as money. Everyone likes money, right?! Well, that only helped a few. Then I tried having them underline the ones place in the numbers and to line those up. That was a flop. Apparently, it's too much work to underline numbers. When I would point it out to students, their response was, "Oh! I forgot." Now, when I say "point it out", all I had to say was, "This is set up incorrectly." and almost immediately they remembered the proper way. So this is why I say that they are just rushing and they really do know how to do this. Don't you hate that this sort of stuff happens a lot in math class?

When I taught fifth grade back in the day, I remember a snowman activity I created that would help students focus on the correct way to set up problems when adding whole numbers with decimals. I gave students a picture of a snowman and a problem. They were to add three numbers, two decimal numbers and one whole number. They were to set up the numbers on the body of the snowman so that the decimal points were the buttons on the snowman. It was only one problem, but my goal with this activity was about quality, not quantity. It really helped that time, so why not try it out with my 7th graders during enrichment?

This is the activity as I created it for my 7th graders.

I made 26 different problems involving addition of two decimal numbers and a whole number. Students were each given a problem but asked to work in groups so that they could discuss and help each other when solving.

Everyone has a different problem, so no cheating could take place. I asked them to solve their problem on the back of their page first so if they had to erase, it was okay. Notice the snowball at the lower right hand corner? That's their problem's letter. After they solve their problem, they were to go to the board to check their answer. They just had to look for their problem's letter to do that.

I also displayed a picture of the snowman with a problem completed to show students how the "buttons" should look. If they answered correctly, they were to complete the front of the page and color the snowman. If they were incorrect, they were to go back and correct it.

Students did enjoy the activity and there were many great discussions. With this activity, I know a great memory was made that will help them remember to line up those decimals! Their discussions also helped them to complete the statement at the bottom of the page. It also makes a great display. It's a win-win!!!

You can find this activity HERE.

I hope you find this activity helpful. It can be used for different grade levels, as a ticket out the door or as I review.

Thanks for reading and have a wonderful day!!!!

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