在小学数学七册课本上,讲述小数乘法法则,是采用反向思维进行的.即这样顺向“扩大”想过去,然后逆向“缩小”想回来,思维一来一去反向进行,增强了思维的难度.不仅学生难于接受,而且教师表述也十分费力,不如将它改成用同向思维教学,即 In the seven primary school mathematics textbook, about the principle of decimal multiplication, is the use of reverse thinking .That is so forward “to expand ” to think of the past, and then reverse “shrink ” want to come back, , To enhance the difficulty of thinking.Not only students difficult to accept, but also very strenuous teacher expression, it is better to change it with the same thinking teaching, that is