This may seem like a lot to put together but remember it has taken me two years to come up with the centers and put them in tubs. I would suggest creating a tub as you use the center in class. It will make your life easier. My class has five math centers a week and rotate each day.
Here are a couple centers they are doing this week.
Students have to put the dogs in order from 1-25 and they place that many spots on the dog. I used black foam and cut out dots.
Beach Ball Decompose/Compose:
Students draw an equation (10+9) and use blocks to show tens and ones. Then they find the beach ball with the answer.
Adding Fluently to 5:
Students have three different bags. They have a bag with numbers that will equal 3, equal 4, and equal 5. Students will draw a number and place that many on the pipe cleaner. Then see how many more they need to make 3, 4, or 5.