The main types include:

Subtraction of abdication within 1 and 20

2, ten plus (minus) ten.

3. Integer decimal plus one digit and corresponding subtraction.

4, two digits plus integer ten, one digit (no carry)

5, two digits MINUS ten, one digit (not abdicating)

6. Add and subtract two digits (no carry, no abdication)

7. Two digits plus one digit (carry)

8. Two digits minus one digit (abdication)

9. Two digits plus two digits (carry)

10, two digits minus two digits (abdication)

Vertical formula

1, write directly if the number of digits is the same, and write large if the number of digits is different.

2. The plus sign is written in seconds, and the horizontal line is drawn in seconds.

3. Under the horizontal line of digital sum, the total should also be added to the horizontal line style.

Refer to the above information? Baidu Encyclopedia-Column Vertical