After school, find two things to do that require math at home.
For 3rd graders: It could be as simple as counting out your snacks, or something more complex like adding all the pillows in your house.
For 4th graders: Do the same assignment, but include subtraction somehow. All the pillows equal a total, but if you were to use a few for a pillow fight, how many are left?
Write the math problems that represent your homework in your notebook and bring to class tomorrow.