Even if they get stepped upon, they will bounce back with a little bending. You can create the cubes ahead of time or have students tape their own cubes. The cubes can be used over and over again. Use a permanent marker to label each side of the cube with a mathematical expression. Below are examples of possible labels for algebraic expressions.
Students roll the two cubes and record their answers on an answer sheet similar to the one below.
The answer sheet can have the operation already indicated, or a third cube can be thrown to determine the operation.