This is a quick fun game that students in third, fourth, and fifth grade can have fun with. Students will practice finding common denominators by using their multiplication or division skills. There are eight different planets with different fractions to match up. Some rocket cards are more difficult than others and provide a challenge for those students who are comfortable with fractions. This game is great for reinforcing common denominator skills with fractions at a math center or individually. Included are directions, recording sheet, and planet cards.