Three knives can cut cube tofu into eight pieces. Take tofu in the picture as an example. The cutting method is as follows:

Step 1: Cross-cut a knife in the middle of the cube height. There are two pieces of tofu at this time.

Step 2: Take the middle position of the front of the tofu and cut the second knife. At this time, the tofu is 4 pieces.

Step 3: Cut the third knife vertically on the basis of the first knife on the front. At this time, the tofu is 8 pieces.

Step 4: According to the logo on the picture, there are four pieces on it. Because the middle piece is divided equally, there are four pieces on the bottom, and they are cut into eight pieces of tofu with an average size.