Final answer:
To find the number of players in Grace's game, we divide the total number of pieces (45) by the number of pieces each player gets (5), using the number sentence 45 divided by 5.
Explanation:
To find the number of people playing the game with Grace, we must use division because we want to determine how many groups of 5 pieces can be made out of the total 45 pieces on the game board. Therefore, the correct mathematical operation to find the number of players is division. The number sentence that can be used to find the number of people playing the game is 45 divided by 5. This math operation will tell us how many times 5 pieces can fit into the total of 45 pieces, thus giving us the number of players in the game.