Use a box. Choose an item. Use inside or outside as you ask your child where to place the item. Examples: "Put the ball outside the box." "Put the doll inside the box."
In addition to these library books, look for the Time for Kids math story that your child will bring home at the end of this unit.
Beep, Beep, Vroom, Vroom! by Stuart J. Murphy, HarperCollins, 2000.
What's Next Nina? by Sue Kassirer, The Kane Press, 2001.