一、原题呈现4.在下表中圈出9 x 1、9 x 2、9 x 3……9 x 9的积。仔细观察9乘几的各个积,你发现了什么?这是人教版教材二年级上册第81页的练习二十第4题,是在学习了“9的乘法口诀”进行的练习。在教师教学用书中,对本题的教学建议是这么写的:利用百数表培养探究及运用规律的能力。第4题可在圈好后,让学生整体感知所圈的9个 First, the original presentation 4. In the table below circled 9 x 1,9 x 2,9 x 3 ...... 9 x 9 product. What do you discover when you look closely at each product of 9 multiples? This is the fourth exercise of Exercise 20 on page 81 of the second edition of the PEP, which is an exercise in learning the multiplication formulas of “9”. In the teaching book for teachers, the teaching suggestions for this question are written as follows: Use the Hundreds List to cultivate the ability to explore and use the law. Question 4 in the circle, let the students as a whole perception of the circle 9