Four small snails walk along the lateral lines of the following shapes. Do they walk the same distance?

The answer is: the first two are the same, and so are the last two.

Interpretation and analysis:

1 Little ant is gone 14 grid.

The second little ant walked 14 grid.

The third little ant has gone 16 grid.

The fourth little ant has gone 16 grid.

The two ants above are the same, and so are the two ants below.

Related knowledge points: perimeter.

The curriculum standard clearly points out the target requirement of "knowing the perimeter", that is, "pointing out and measuring the perimeter of specific figures, exploring and mastering the perimeter formulas of rectangles and squares".

In addition, in the overall goal of mathematics curriculum, "get some preliminary mathematical practical experience and be able to use the knowledge and methods learned to solve simple problems;" Feeling the role of mathematics in daily life "is also the goal requirement of" knowing the perimeter ".

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