How to write vertical calculation in primary school mathematics?

Examples of writing order division are as follows:

42 divided by 7.

On a scale of 4 [from high to low]. When calculating the division vertically, start from most significant bit, such as: 42 from most significant bit 4; If you can't get rid of it.

For example, if 4 is not divisible by 7, then use the highest bit and the next bit to synthesize a number to be divisible until the dividend can be divisible; For example, if 4 is not divisible by 7 in 42, then 4 and 2 are combined into a number. If 42 is divided by 7, the quotient is 6.

Extended data:

Vertical calculation method

1, addition

The same numbers are aligned. If the sum exceeds 10, it will move forward to 1. (The numbers should be aligned. ) such as:

435

+697

———

1 132

Step 2 subtract

If the same number is aligned, borrow 1 from the previous number as 10 if it is not reduced enough. For example:

756

-569