1. Compare two boxes with different widths by various methods, such as direct observation, overlapping, rope quantity, etc. At this step, students can only say who is wide and who is narrow.
2. On the basis of comparing two boxes with different widths, add another box.
(1) Know the widest and narrowest. When there are three or more objects, you can find the widest and narrowest.
(2) According to the widths of the three boxes, let the students know the relativity of the widths. If box 3 is the widest, box 2 is the second, and box 1 is the narrowest, let the students say: 3 is wider than 2, 2 is wider than 1; Guide students to feel that 2 is narrow for 3 and wide for 1. Different objects will get different results. At this level, students can be guided to describe width and narrowness from different angles.
3. Different exercises
(1) The same box is wider than the width.
(2) Give a wide standard and find a box narrower than it.
(3) Give a narrow box and find a box wider than it.
4. Guide students to ask and answer questions independently.