Final answer:
Tony can make approximately 21 pieces of yarn.
Step-by-step explanation:
To determine how many pieces of yarn Tony can make, we need to divide the length of the yarn he has by the length of each piece.
Given that Tony has a piece of yarn that is 13.65 centimeters long, and he wants to make pieces that are 0.65 centimeters long, we can divide the length of the yarn he has by the length of each piece:
Number of pieces = Length of yarn / Length of each piece
Number of pieces = 13.65 cm / 0.65 cm
Number of pieces ≈ 21 pieces
Therefore, Tony can make approximately 21 pieces of yarn.