A teacher places seven cards, lettered A-G, in a table. Which cards show irrational numbers?

In which row of the table does 0.123 go? Why? [Row 2, because the decimal does not terminate but does repeat.] Ok. So this number is a non-terminating repeating decimal because the bar shows it has endless repeats of the same three digits. [Write this on the card.] Show me on your whiteboard: isrational or irrational?