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# Math Centers - Subtraction

Lesson 11 of 19

## Objective: Students will be able to independently practice addition and subtraction.

#### Problem of the Day

*5 min*

I start each math lesson with a Problem of the Day. I use the procedures outlined here on Problem of the Day Procedures.

Today's Problem of the Day:

**Solve. Draw a picture to show how you found your answer. 9 - 7 =**

For this problem, I created a Notebook file with a lot of open space for students to draw. I also put an equation for the students to solve. If you do not have a SMARTBoard, you can use the PDF file. You could also have the students solve the problem by drawing a picture on paper or the board or using manipulatives.

I have one student come up and work on this problem. I remind student to check his or her work when they are finished and have the class tell if they agree or disagree by showing a thumbs up or thumbs down. I am also looking for students to explain how they solved the problem (Mathematical Practice 3: Construct viable arguments and critique the reasoning of others).

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#### Introducing Centers

*25 min*

I use math centers in my classroom as a way to reinforce the skills that are being taught. Students are able to practice the skills we are currently working on as well go back and revisit the skills taught in previous units. The math centers give students a chance to work independently or with their peers to complete a task. The students are not just learning and practicing number skills, they are also working on social skills including taking turns, sharing, and working cooperatively. Having students working in centers also allows me time to pull small groups of student to my table to work on skills specific to their needs.

I have the students move into a circle. I remind students to sit on the hard floor so that there is space for everyone. I bring up all of the center trays. I explain and model how to complete each center. This week's centers are:

- Monster Subtraction (Teacher Created Resource)
- Loosing Teeth Subtraction (Teacher Created Resource)
- Piggy Bank Subtraction (from Kindegarten Crayons)
- Domino Parking Lot (from Once Upon a First Grade Adventure)
- Critter Junction Subtraction on SMARTBoard/Computer (from MacMillan McGraw-Hill)

Each center is explained in the video located in the next section.

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The following centers are kept in a stack of plastic drawers in my classroom. Each drawer has a number on it which corresponds to the numbers on the student tables. The students take the center out of their numbered drawer, complete the center and return it to that same drawer when it is time to clean up.

Click on each center below to see a video explanation.

Critter Junction Subtraction (There is no video for this center. It is an online game that can be played on computers or a SMART board.)

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#### Practice

*20 min*

Once I have introduced all of the centers, I have the students go back to their seats. I remind students of our center rules. Students need to work quietly and stay at their seats. Materials need to remain on the table and be cleaned up quickly and quietly when the clean up song comes on. I call up one student from each table to come back and get their center. I circulate through the room to make sure that all of the centers are being done correctly. We have been doing centers for a while now and all of these centers are about skills that we have already covered, so I pull groups today to work on decomposing.

Once students are set with centers, I begin working on subtracting with small groups. I give students an equation and they need to count out the correct number of manipulatives and take away the correct number to find the answer.

Prior to taking the last group, I count down from 5 and say "Freeze." When I say this, all students stop what they are doing, put their hands on their heads and look at me. This is a procedure that we use throughout the day. I say to students,* **"You have about five minutes left. Remember when the clean up song comes on, you need to quietly put all of your materials back in your container and return it to the math center drawer. It needs to be in the drawer that matches your table number."* I let the students work for five more minutes and then turn on Tidy Up by Dr. Jean. There are many wonderful transition songs to be found, for free, online if you'd like to use music for transitions too. Students clean up and return to their seats.

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- LESSON 1: Math Centers - Review Previous Skills
- LESSON 2: Solving Subtraction Number Stories- In Space
- LESSON 3: Solving Subtraction Number Stories- Under the Sea
- LESSON 4: Solving Subtraction Number Stories- Writing the Answer Day 1
- LESSON 5: Solving Subtraction Number Stories- Writing the Answer Day 2
- LESSON 6: Introducing the Minus Sign
- LESSON 7: Reviewing the Equal Sign
- LESSON 8: Subtracting from 4
- LESSON 9: Subtracting from 5
- LESSON 10: Subtracting from 6
- LESSON 11: Math Centers - Subtraction
- LESSON 12: Subtracting from 7
- LESSON 13: Subtracting from 8
- LESSON 14: Subtracting from 9
- LESSON 15: Subtracting from 10
- LESSON 16: Subtraction Number Stories- Day 1
- LESSON 17: Subtraction Number Stories- Day 2
- LESSON 18: Subtraction Number Stories- Day 3
- LESSON 19: What Have We Learned? (Subtraction)