“比和比例”教学建议中卫县一小许卫华“比和比例”是小学五年制第十册（六年制第十二册）教材中的重点和难点。本单元不但和整数除法、分数乘除法、列方程解应用题等知识有着密切关系，而且是过去所学知识的发展和综合运用。一、教材分析这一单元主要是研究数量关系中的... Proportions and Proportions Teaching Suggestions A little Xu Weihua's “Proportional and Proportion” of Zhongwei County is the key and difficult point in the teaching materials of the tenth year of five-year primary school (six-year twelfth volume). This unit not only integer division, fractional multiplication and division, the column equation solution problems and other knowledge is closely related, but also in the past knowledge development and comprehensive use. First, the textbook analysis of this unit is mainly to study the relationship between quantity ...