1, you can make an elephant weighing seesaw, which probably means that the elephant stands at one end and uses the lever principle at the other end. When the weight of the items is the same as that of the elephant, the weights of the items can be added to calculate the weight of the elephant.

2. Tie the elephant with a steel cable, and then tie a big basket at the other end of the steel cable with the pulley of the crane, and put heavy objects in the basket. When the weights are equal, they will be balanced. The weight of an elephant can be calculated by calculating the weight.

3. Make a scale similar to a balance, with an elephant on one side and an object convenient to weigh and carry on the other.