This semester, a friend of mine teaches first-grade mathematics. In terms of the composition of teaching numbers, students in both classes suggest that 5 can be divided by 5 and 0, and 4 can be divided by 4 and 0. There is no such division in the textbook, but my friend thinks that since the students put it forward, they should definitely regard this division on the blackboard as the composition of numbers.

When I went back to the office to discuss with the teachers in the same group, I had different opinions. Some teachers think that it is wrong to divide into 0 and several, not into two parts, so this division is wrong; Some teachers think it can be divided, but first-year students don't need to master or advocate it, but they can't say right or wrong. But friends think it's right, because only 0 can't be scored, but there is no rule that some parts can't be scored. Since 0 plus 5 equals 5, it can be divided into 5 and 0.

Classification of teaching materials

5 can be divided into 1 and 4, 2 and 3, 3 and 2, 4 and 1.