Vertical decimal division: mainly depends on divisor. The divisor is a few decimal places. Just expand the divisor by the same multiple at the same time to make it an integer, and calculate it according to the law of integer division.
Arithmetic of decimal multiplication:
1, first quadrature according to the law of integer multiplication.
2. See how many decimal places the multiplicand and multiplier * * * have. Just count the numbers from the right side of the product and point to the decimal point.
3. If there is a 0 after the decimal point, cross out the 0 after the decimal point according to the basic properties of the decimal point.
Vertical calculation
There are two main points in the calculation of column vertical pen: the same digit alignment, starting from the unit. You can add ten digits first without carrying, but it is not recommended for carrying addition later. The format of exercise books is strictly in accordance with the following requirements:
1, the horizontal formula is written from the left end of the horizontal grid line in the math book.
2. The first addend in vertical form is written under the second addend in horizontal form, and the plus sign is aligned with the plus sign in horizontal form. The same numbers of addend, addend and sum must be aligned.
3. After calculating the vertical columns, don't miss the horizontal numbers.