Children in grade one are only eight or nine years old, right? There is a great possibility of development, so don't force him, it may be counterproductive. Can the formula of addition, subtraction, multiplication and division be used? It's a small price to expose him to mathematics in his daily life, such as going to the supermarket to buy snacks. There is a bag of sugar. There are five pieces of sugar in it. The price is ten yuan. Ask him how much a piece of candy costs. If he answers correctly, give him the bag of candy.