6th grade addition of three numbers Monster board game - Learn Addition of three numbers game - this addition of three big numbers game was designed especially to help 6th graders polish their addition skills. This online game will give 6th graders a place to practice their addition skills, so they can improve their skills in addition. Students will be required to carry or regroup their mental math abilities, as they will be required to answer questions in a fast pace. This is a multiple choice trivia, where students will be presented with three big numbers they will have to add, and pick the correct answer from the four options presented to them. They will try to win as many points as they can, and try to avoid the monster that can take away all their points and leave them with nothing.