Starting with high dividends,

The divisor is 1 digit, just look at the first 1 digit of the dividend.

Extended data

1, plus vertical calculation jingle:

When two numbers are added, the result of the addition is called sum; Don't forget the numbers on the right, one for every ten.

2. Subtractive vertical calculation of jingle:

Subtraction is used from big to small, and the result of subtraction is called difference; Digital alignment starts from the right, and when it is not enough, take the front position.

3. Vertical calculation of multiplication jingle:

It is not difficult to multiply two numbers. There are three points in the calculation process: the multiplier must be calculated first and then multiplied by ten digits; The last digit of the product is the key, which is opposite to the ten digits; After the two products are added up, calculate the number of layers in your mind.

4. Vertical calculation of static music division:

Divide two by two, and two is not enough to divide three; Except the quotient, the remainder is less than the divisor; Then, except for the next item, the test method should be flexible.