What is the largest number of 2 cm squares that can be cut from a 1 dm2 square?

Let’s calculate the area of a small square.
S = a * a = a², where a is the length of the side of the square.
S = 2² = 4 sq. Cm.
Let’s translate square dm. in square centimeters.
1 dm. = 10 cm, which means 1 sq. dm. = 100 sq. cm.
Let’s count the number of small squares in a large one:
100: 4 = 25 pieces
Answer: 25 small ones can be cut out of a large square.