3. 14*3=9.42
3. 14*4= 12.56
3. 14*5= 15.7
3. 14*6= 18.84
3. 14*7=2 1.98
3. 14*8=25. 12
3. 14*9=28.26
3. 14* 10=3 1.4
3. 14* 1 1=34.54
3. 14* 12=37.68
3. 14* 13=40.82
3. 14* 14=43.96
3. 14* 15=47. 1
3. 14* 16=50.24
3. 14* 17=53.38
3. 14* 18=56.52
3. 14* 19=59.26
3. 14*20=62.8
Extended data
Calculation method of decimal multiplication:
1, first expand the decimal into an integer.
2. Calculate the product according to the law of integer multiplication.
3. Look at a factor * * *, how many decimal places there are, and count the decimal places from the right of the product. When the number of decimal places of the multiplied product is not enough, you should add 0 before counting the decimal points.
Note: In the calculation results, the 0 at the end of the decimal part should be removed to simplify the decimal; When the number of decimal places is not enough, use 0 to occupy the place.
Matters needing attention in vertical decimal multiplication
1, with vertical columns, is mantissa alignment of factors.
2. When the column is vertical, for the convenience of calculation, factors with more digits are generally put on it.
3. If there are integer 10000 factors, the first digits of the two factors from the right are non-zero-aligned, and then the corresponding number of zeros is filled in the number.
If there is 0 at the end of the number, count the decimal point first, and then go to 0.
5. If there are not enough decimal places, you need to add 0 in front.