All math teachers of beginners should be sure to have the numbers from one to about twenty on the floor. You can use rubber disks with numbers written on them if you can’t mark your floor. Students can stand on a number and move ahead three for adding three; back two for subtracting two, etc. Other applications include stepping ahead on even numbers or odd numbers. For an additional activity to develop number sense, you can number steps if there’s a stairs in your building. Going higher to each added number and lower for each subtracted number helps them understand the increase of addition/decrease of subtraction.
On another note–steps can be labeled with notes of the scale, with a student stepping up a step if he hums so; then la, etc. For an added element, blocks of wood of appropriate thickness can be laid on the proper steps to provide the “half steps.”