Subtract Two Digit Numbers - Pirate Gamer Online For first, second, third, 4th grade math revision | Pirage Game | Math games online for children. Learn how to subtract with or without carrying. Two digit numbers range from 10 to 99. Within that range, students will solve subtraction problems containing two numbers. In some cases they have to regroup and in others they don't have to regroup. It is a fun game which students enjoy and the fun goes with learning a new skill.