2. Mathematical rope folding problem.

3. Teaching reflection on the problem of math rope folding in half.

4. Thinking about the problem of mathematical rope folding in half.

1. A rope is folded in half once. Compared with the original rope, the number of segments is doubled, that is, multiplied by12, the length is converted into two segments, and the total length of the rope is divided by the number of segments 2.

2. Fold it twice, double the number of segments on the basis of folding once, and then multiply it by 2, that is, multiply it by 2 2, and the length is folded into 4 segments, and the total length of the rope is divided by 4.

3. Fold it in half for three times, and the number of segments will continue to double, that is, multiply it by three and two, the length will be converted into eight segments, and the total length of the rope will be divided by eight.

4. That is to say, fold it several times. When we do multiplication, we can calculate the length of the rope by multiplying it by several twos.