After spending a considerable amount of time on addition and number bonds, we’re moving on to subtraction. The transition has been incredibly smooth, and I believe that is due in large part to our focus on number bonds and understanding the part-part-whole model. So rather than jumping into subtraction as a completely new concept (disconnected from anything we’ve previously done), we’re simply rearranging our number bonds. While we started with the concrete, hands-on representations, we’ve also made some wonderful connections as we’ve moved to more formal number sentences. This Number Sentence Roll and Write activity has been so much fun, and is perfect practice for writing addition and subtraction number sentences!
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This activity has been helpful in forming connections between addition and subtraction, as well as a great introduction to formal math symbols.
Math is a foreign language, and it is important to help kids understand that even though they may be able to show a concept with blocks or explain it in words, they also need to be able to write in math language.
Materials Needed for Number Sentence Roll and Write:
- Number sentence recording page (download FREE below!)
- 1-2 dice (we used giant foam dice because it makes things more fun, but you don’t have to!)
Writing Addition and Subtraction Number Sentences:
Using a die (or two), have the child roll a number. Record the first number on the page and then roll again. Record this number in the roll #2 column.
Then, students use the two numbers as the “parts” to write two addition sentences (thus modeling the commutative property).
The child then uses the “whole” found by adding to write two subtraction sentences as well.
Then, they can roll again and continue until they complete the chart.
It is important to note that before I had my daughter write this out on her own, we did a lot of hands-on play and math talk.
For example, we would build a number (say, seven) with base ten blocks or unifix cubes and I would ask her to break it into two parts. I would then say, “What it the total number of blocks?” and she would respond, “Seven.”
So we would see, yes, three blocks and four blocks make a total of seven blocks. Then I would switch the blocks around and say, “Now you have four blocks and three blocks. Is it still seven?” Of course, the answer is yes.
Then, I would take one set of blocks away and say, “What happens when I take away four blocks? How many are left?” and she would see that three blocks are left. I would then do the same with the three blocks to show that seven take away three is four.
I then did the same thing with the dice. She would roll and determine the total, and then I would take away one of the dice to show that the “other part” is what remains.
This was a helpful visual model of the number sentences. She was able to see and understand the concepts before I introduced the more formal math vocabulary and before I asked her to write it out with mathematical symbols.
This activity has also been a great introduction to writing addition and subtraction number sentences, an important skill that we will continue to develop.
Mathematics is a way to model the world around us, from these very basic addition and subtraction models to advanced Calculus, so understanding that each number and symbol in the “math sentence” represents a real thing and has meaning is an essential skill!
And of course, giant foam dice make everything more fun, so I highly encourage you to invest in a set! 😉
What are some of your favorite ways to teach and model subtraction? Do you have any fun games to share?
You may also be interested in the following free resources:
And if you’re teaching older kids, you may like this activity for multiplication and division!