在人教版教材中,化简比的例题都是用比的基本性质进行计算的。在实际教学中,我发现有些题目用比的基本性质化简比较繁琐,而用求比值的计算方法或约分的方法化简相对简单。例如,把1.5∶0.3化简成最简单的整数比。教材的方法:1.5∶0.3=(1.5×10)∶(0.3×10)=15∶3=(15÷3)∶(3÷3)=5∶1 In the PEP textbook, examples of simplification are calculated using the basic properties of ratio. In the actual teaching, I found that some topics are cumbersome to use than the basic nature of the simplified, and the use of ratio calculation method or approximate method of simplification is relatively simple. For example, reduce 1.5:0.3 to the simplest integer ratio. Method of textbook: 1.5: 0.3 = (1.5 × 10) :( 0.3 × 10) = 15: 3 = (15 ÷ 3): (3 ÷ 3) = 5: 1