After the first folding, cut into three sections (2+1);
After the second folding, cut into 5 sections (2+1+2);
So a line is folded in half and then folded in half, and cut from the middle. The cut line has five sections.
Extended data:
Multiplication is a simple operation of addition and division is a simple operation of subtraction.
Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations.
Integer addition and subtraction algorithm;
1, aligned with the same number;
2. Starting from the unit;
3. When the addition reaches dozens, it will be promoted to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.
Properties of addition operation
From additive commutative law's associative law, it can be concluded that when several addends are added, the positions of addends can be exchanged at will; Or add a few addends first and then add them with other addends, and the sum remains the same.