The vertical calculation method of division in grade three is as follows: when calculating division vertically, the first position of quotient is written wrong. When children see that the single digit of the dividend is 0, tell the teacher that the end of division is 0 in class, and they can ignore this principle first. The reason is that they are not familiar with the division of vertical calculation and do not understand it thoroughly.

For example, 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 it is not divisible, such as: 4 is not divisible by 7, then use the highest bit and the next bit to synthesize a number to be divisible until it can be divisible by the divisor; 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.

Law of division:

Remember that all items in the divisibility of numbers should be integers. But the divisor is not equal to 0, and the quotient is an integer with no remainder. When a÷b, it can be said that number B can be divisible by a, number A can be divisible by b, a is a multiple of number B, and b is a divisor of number A. If you ask for a divisor, you must remove the natural number, and if you ask for a multiple, you must multiply it by the natural number.

Bits divisible by 2, 5 and 3 are 0 and 5, and must be divisible by 5. The units are 2, 4, 6, 8 and 0, and they must be divisible by 2. If the sum of each number is a multiple of 3, it must be divisible by 3.