1. Start writing online in Tian Zige.

2. Draw an arc to the lower left.

3. Draw an arc to the upper right after touching the bottom line.

4. Continue to draw an arc to the upper right.

5. When the arc is aligned with the middle of the upper line, draw an arc to the lower right.

6. When the arc is aligned with the middle of the bottom line, draw an arc to the upper left.

7. return the pen and collect the pen.

The writing of 0 in mathematics needs attention:

1, write 0 from top to bottom, from left to right, the starting point and the receiving point should be connected, and the writing should be smooth and not angular.

2. In numbers, 0 cannot exist as a number alone. If a number has only one 0, then this 0 needs to be written in the center of the position; If there are two zeros in the number, you need to float the second zero up and down. For example, the number "100", the first 0 should be written in the middle, and the second 0 can float up and down slightly.

In mathematics, 0 is often used as a placeholder. For example, in the score "1/0", the denominator 0 means meaningless; In decimal "0.5", 0 is a placeholder, indicating that there are no other numbers after the decimal point.

4. In mathematics, 0 is also used as a benchmark. For example, in the coordinate system, the abscissa and ordinate of the origin are both 0; In temperature measurement, the freezing point of water is 0 degrees Celsius.

5. In mathematics, 0 is often used as the dividing point. For example, on the number axis, 0 separates positive and negative numbers; In statistics, 0 is often used as the symbol of the lower or upper limit of a set of data.

6. In mathematics, 0 is often used as the symbol of infinity. For example, in the definition of limit, when n tends to infinity, any number can be expressed as the addition of n zeros; In the definition of series, infinite series can be expressed as the addition of several zeros.

7. In mathematics, 0 is often used as a variable. For example, in algebraic equations, x can be interpreted as unknown number 0; In probability theory, 0 can represent the probability of an impossible event.

8. In mathematics, the "0" and "O" in handwriting are very similar and easy to be confused, so we should pay attention to the distinction.