Vertical calculation refers to a vertical calculation in the calculation process, which makes the calculation simple. In addition calculation, the same numbers are aligned. If the sum exceeds 10, it will move forward to 1. When subtracting, the same numbers are aligned. If it is not enough, borrow 1 from the last digit as 10.
The vertical calculation method of multiplication: the 1 bit of one number is multiplied by the 1 bit of another number and added to the i+j- 1 bit of the product.
The method of vertical calculation of addition: the same number of digits is aligned. If the sum exceeds 10, proceed to 1. (The numbers should be aligned. )
The vertical calculation method of subtraction: the same number of digits is aligned. If the subtraction is not enough, borrow 1 from the last digit as 10.
Vertical calculation method of division: when calculating division vertically, start from the most significant bit. If it can't be divided, then the highest bit and the next bit are combined into a number to divide until the divisor can be divided.
First of all, in the calculation of three-digit addition and subtraction, if there are no brackets in the formula, we can add and subtract from left to right in turn to get an accurate answer. Then when you encounter parentheses, you need to calculate the number in parentheses first, and then calculate the number outside parentheses. If there is a symbol of multiplication and division, first calculate multiplication and division and then add and subtract.