In a 12 cm long, 6 cm wide rectangular piece of paper, cut a 1 cm radius disc, you can cut up to () discs

In a 12 cm long, 6 cm wide rectangular piece of paper, cut a 1 cm radius disc, you can cut up to () discs

1 * 2 = 2 (diameter)
6 / 2 = 3 (3 rows)
12 / 2 = 6 (6 in a row)
3 * 6 = 18 (can cut 18 pieces)