Students practice their addition facts to 18 by playing the game Bump. Each child takes turns rolling the dice. The student adds up the sum of the two dice, and covers the number that is the same as that sum. If someone rolls a number that the other player rolled, he or she can "BUMP" the counter. If the child rolls the same number twice, they can freeze that number, so it cannot be bumped. Children take turns till numbers are filled or time duration is finished.