Let children know RMB first, from the numbers on the first RMB and the units on the second RMB. Practice again and again after you know each one. With regard to conversion, it is necessary to guide the problem to the mathematical point of view. If the units are the same, first remove the units for conversion, and the average child should be able to do it. If the units are different, it is necessary to practice 1 yuan = 10, 1 = 10.