Specifically, the subtraction of eating watermelon is to regard watermelon as a number, eat a part at a time, and the rest is the original number MINUS a smaller number. For example, a complete watermelon is 10, if you eat half, you will have 5, if you eat half, you will have 2.5, and so on.

In this way, children can understand the concept of subtraction more intuitively and easily master the calculation method of subtraction. At the same time, eating watermelon subtraction can also help children understand the concept of score. For example, half a watermelon is half of the whole watermelon, which is 1/2.